Building resources - Turn-key research data management repository

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class="md-nav__link"> <span class="md-ellipsis"> Static pages </span> </a> </li> <li class="md-nav__item"> <a href="../../../customize/dois/" class="md-nav__link"> <span class="md-ellipsis"> DOI registration </span> </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_4_11" > <label class="md-nav__link" for="__nav_4_11" id="__nav_4_11_label" tabindex="0"> <span class="md-ellipsis"> Other PIDs integrations </span> <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="2" aria-labelledby="__nav_4_11_label" aria-expanded="false"> <label class="md-nav__title" for="__nav_4_11"> <span class="md-nav__icon md-icon"></span> Other PIDs integrations </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../../customize/other-pids/urns/" class="md-nav__link"> <span class="md-ellipsis"> DNB URNs </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="../../../customize/s3/" class="md-nav__link"> <span class="md-ellipsis"> Storage </span> </a> </li> <li class="md-nav__item"> <a href="../../../customize/upload_limits/" class="md-nav__link"> <span class="md-ellipsis"> Upload Limits </span> </a> </li> <li class="md-nav__item"> <a href="../../../customize/metadata_only/" class="md-nav__link"> <span class="md-ellipsis"> Metadata-only records </span> </a> </li> <li class="md-nav__item"> <a href="../../../customize/Logging/" class="md-nav__link"> <span class="md-ellipsis"> Logging </span> </a> </li> <li class="md-nav__item"> <a href="../../../customize/i18n-and-l10n/" class="md-nav__link"> <span class="md-ellipsis"> Internationalisation (i18n) and Localisation (l10n) </span> </a> </li> <li class="md-nav__item"> <a href="../../../customize/notifications/" class="md-nav__link"> <span class="md-ellipsis"> Notifications </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--active md-nav__item--section md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_5" checked> <label class="md-nav__link" for="__nav_5" id="__nav_5_label" tabindex=""> <span class="md-ellipsis"> Develop </span> <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_5_label" aria-expanded="true"> <label class="md-nav__title" for="__nav_5"> <span class="md-nav__icon md-icon"></span> Develop </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../" class="md-nav__link"> <span class="md-ellipsis"> Overview </span> </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_5_2" > <label class="md-nav__link" for="__nav_5_2" id="__nav_5_2_label" tabindex="0"> <span class="md-ellipsis"> Getting started </span> <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="2" aria-labelledby="__nav_5_2_label" aria-expanded="false"> <label class="md-nav__title" for="__nav_5_2"> <span class="md-nav__icon md-icon"></span> Getting started </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../getting-started/source-code/" class="md-nav__link"> <span class="md-ellipsis"> Source code </span> </a> </li> <li class="md-nav__item"> <a href="../../getting-started/package-development/" class="md-nav__link"> <span class="md-ellipsis"> Package development </span> </a> </li> <li class="md-nav__item"> <a href="../../getting-started/instance-development/" class="md-nav__link"> <span class="md-ellipsis"> Instance development </span> </a> </li> <li class="md-nav__item"> <a href="../../getting-started/debugging/" class="md-nav__link"> <span class="md-ellipsis"> Debugging </span> </a> </li> <li class="md-nav__item"> <a href="../../getting-started/code-style/" class="md-nav__link"> <span class="md-ellipsis"> Coding style </span> </a> </li> <li class="md-nav__item"> <a href="../../getting-started/virtualenvs/" class="md-nav__link"> <span class="md-ellipsis"> Virtual environments </span> </a> </li> <li class="md-nav__item"> <a href="../../getting-started/help/" class="md-nav__link"> <span class="md-ellipsis"> Getting help </span> </a> </li> <li class="md-nav__item"> <a href="../../process/" class="md-nav__link"> <span class="md-ellipsis"> Development process </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_5_3" > <label class="md-nav__link" for="__nav_5_3" id="__nav_5_3_label" tabindex="0"> <span class="md-ellipsis"> Best practices </span> <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="2" aria-labelledby="__nav_5_3_label" aria-expanded="false"> <label class="md-nav__title" for="__nav_5_3"> <span class="md-nav__icon md-icon"></span> Best practices </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../best-practices/accessibility/" class="md-nav__link"> <span class="md-ellipsis"> Accessibility (a11y) </span> </a> </li> <li class="md-nav__item"> <a href="../../best-practices/commits/" class="md-nav__link"> <span class="md-ellipsis"> Commits, PRs & reviews </span> </a> </li> <li class="md-nav__item"> <a href="../../best-practices/css-js/" class="md-nav__link"> <span class="md-ellipsis"> CSS/JavaScript </span> </a> </li> <li class="md-nav__item"> <a href="../../best-practices/react/" class="md-nav__link"> <span class="md-ellipsis"> React </span> </a> </li> <li class="md-nav__item"> <a href="../../best-practices/ui/" class="md-nav__link"> <span class="md-ellipsis"> User interface </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--active md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_5_4" checked> <label class="md-nav__link" for="__nav_5_4" id="__nav_5_4_label" tabindex="0"> <span class="md-ellipsis"> Topic guides </span> <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="2" aria-labelledby="__nav_5_4_label" aria-expanded="true"> <label class="md-nav__title" for="__nav_5_4"> <span class="md-nav__icon md-icon"></span> Topic guides </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item md-nav__item--active"> <input class="md-nav__toggle md-toggle" type="checkbox" id="__toc"> <label class="md-nav__link md-nav__link--active" for="__toc"> <span class="md-ellipsis"> Building resources </span> <span class="md-nav__icon md-icon"></span> </label> <a href="./" class="md-nav__link md-nav__link--active"> <span class="md-ellipsis"> Building resources </span> </a> <nav class="md-nav md-nav--secondary" aria-label="Table of contents"> <label class="md-nav__title" for="__toc"> <span class="md-nav__icon md-icon"></span> Table of contents </label> <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix> <li class="md-nav__item"> <a href="#directory-structure" class="md-nav__link"> <span class="md-ellipsis"> Directory structure </span> </a> </li> <li class="md-nav__item"> <a href="#resource" class="md-nav__link"> <span class="md-ellipsis"> Resource </span> </a> </li> <li class="md-nav__item"> <a href="#resource-config" class="md-nav__link"> <span class="md-ellipsis"> Resource config </span> </a> </li> <li class="md-nav__item"> <a href="#instantiating-a-resource" class="md-nav__link"> <span class="md-ellipsis"> Instantiating a resource </span> </a> </li> <li class="md-nav__item"> <a href="#routing" class="md-nav__link"> <span class="md-ellipsis"> Routing </span> </a> </li> <li class="md-nav__item"> <a href="#response-serialization-content-negotiation" class="md-nav__link"> <span class="md-ellipsis"> Response serialization (content negotiation) </span> </a> </li> <li class="md-nav__item"> <a href="#parameter-parsing" class="md-nav__link"> <span class="md-ellipsis"> Parameter parsing </span> </a> <nav class="md-nav" aria-label="Parameter parsing"> <ul class="md-nav__list"> <li class="md-nav__item"> <a href="#resource-request-context" class="md-nav__link"> <span class="md-ellipsis"> Resource request context </span> </a> </li> <li class="md-nav__item"> <a href="#parsing-the-url-query-string" class="md-nav__link"> <span class="md-ellipsis"> Parsing the URL query string </span> </a> </li> <li class="md-nav__item"> <a href="#parsing-the-request-body" class="md-nav__link"> <span class="md-ellipsis"> Parsing the request body </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="#error-handling" class="md-nav__link"> <span class="md-ellipsis"> Error handling </span> </a> </li> <li class="md-nav__item"> <a href="#bootstrap" class="md-nav__link"> <span class="md-ellipsis"> Bootstrap </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="../service/" class="md-nav__link"> <span class="md-ellipsis"> Building services </span> </a> </li> <li class="md-nav__item"> <a href="../serializers/" class="md-nav__link"> <span class="md-ellipsis"> Building serializers </span> </a> </li> <li class="md-nav__item"> <a href="../uow/" class="md-nav__link"> <span class="md-ellipsis"> Grouping atomic operations </span> </a> </li> <li class="md-nav__item"> <a href="../validation/" class="md-nav__link"> <span class="md-ellipsis"> Sanitize input data </span> </a> </li> <li class="md-nav__item"> <a href="../theming/" class="md-nav__link"> <span class="md-ellipsis"> Theming </span> </a> </li> <li class="md-nav__item"> <a href="../administration_panel/" class="md-nav__link"> <span class="md-ellipsis"> Administration panel </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_5_5" > <label class="md-nav__link" for="__nav_5_5" id="__nav_5_5_label" tabindex="0"> <span class="md-ellipsis"> How-to guides </span> <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="2" aria-labelledby="__nav_5_5_label" aria-expanded="false"> <label class="md-nav__title" for="__nav_5_5"> <span class="md-nav__icon md-icon"></span> How-to guides </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../howtos/i18n/" class="md-nav__link"> <span class="md-ellipsis"> Translation (i18n) </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/custom_fields/" class="md-nav__link"> <span class="md-ellipsis"> Create a new custom field </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/custom_code/" class="md-nav__link"> <span class="md-ellipsis"> Create custom code and views </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/add_javascript/" class="md-nav__link"> <span class="md-ellipsis"> Add JavaScript </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/override_components/" class="md-nav__link"> <span class="md-ellipsis"> Override UI React components </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/search_terms_migration/" class="md-nav__link"> <span class="md-ellipsis"> Create search terms mappings </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/alembic/" class="md-nav__link"> <span class="md-ellipsis"> Create a database migration </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/security-fix/" class="md-nav__link"> <span class="md-ellipsis"> Fix a vulnerability </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/dev_email/" class="md-nav__link"> <span class="md-ellipsis"> Test emails locally </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/route_migration/" class="md-nav__link"> <span class="md-ellipsis"> Migrate legacy routes </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/backup_search_indices/" class="md-nav__link"> <span class="md-ellipsis"> Back up search indices </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/restrict_access/" class="md-nav__link"> <span class="md-ellipsis"> Restrict access to pages </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/notifications/" class="md-nav__link"> <span class="md-ellipsis"> Create and configure notifications </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_5_6" > <label class="md-nav__link" for="__nav_5_6" id="__nav_5_6_label" tabindex="0"> <span class="md-ellipsis"> Architecture </span> <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="2" aria-labelledby="__nav_5_6_label" aria-expanded="false"> <label class="md-nav__title" for="__nav_5_6"> <span class="md-nav__icon md-icon"></span> Architecture </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../architecture/" class="md-nav__link"> <span class="md-ellipsis"> Introduction </span> </a> </li> <li class="md-nav__item"> <a href="../../architecture/infrastructure/" class="md-nav__link"> <span class="md-ellipsis"> Infrastructure </span> </a> </li> <li class="md-nav__item"> <a href="../../architecture/software/" class="md-nav__link"> <span class="md-ellipsis"> Software </span> </a> </li> <li class="md-nav__item"> <a href="../../architecture/runtime/" class="md-nav__link"> <span class="md-ellipsis"> Runtime </span> </a> </li> <li class="md-nav__item"> <a href="../../architecture/requests/" class="md-nav__link"> <span class="md-ellipsis"> Requests </span> </a> </li> <li class="md-nav__item"> <a href="../../architecture/communities/" class="md-nav__link"> <span class="md-ellipsis"> Communities </span> </a> </li> <li class="md-nav__item"> <a href="../../architecture/records/" class="md-nav__link"> <span class="md-ellipsis"> Records </span> </a> </li> <li class="md-nav__item"> <a href="../../architecture/event_handling/" class="md-nav__link"> <span class="md-ellipsis"> Event handling </span> </a> </li> <li class="md-nav__item"> <a href="../../architecture/notifications/" class="md-nav__link"> <span class="md-ellipsis"> Notifications </span> </a> </li> <li class="md-nav__item"> <a href="../../architecture/reading/" class="md-nav__link"> <span class="md-ellipsis"> Recommended reading </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_5_7" > <label class="md-nav__link" for="__nav_5_7" id="__nav_5_7_label" tabindex="0"> <span class="md-ellipsis"> Concepts </span> <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="2" aria-labelledby="__nav_5_7_label" aria-expanded="false"> <label class="md-nav__title" for="__nav_5_7"> <span class="md-nav__icon md-icon"></span> Concepts </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../concepts/concurrency-control/" class="md-nav__link"> <span class="md-ellipsis"> Optimistic concurrency control </span> </a> </li> <li class="md-nav__item"> <a href="../../concepts/transactions/" class="md-nav__link"> <span class="md-ellipsis"> Database transaction management </span> </a> </li> </ul> </nav> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="../../../deploy/" class="md-nav__link"> <span class="md-ellipsis"> Deploy </span> </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_7" > <label class="md-nav__link" for="__nav_7" id="__nav_7_label" tabindex="0"> <span class="md-ellipsis"> Reference </span> <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_7_label" aria-expanded="false"> <label class="md-nav__title" for="__nav_7"> <span class="md-nav__icon md-icon"></span> Reference </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../../reference/" class="md-nav__link"> <span class="md-ellipsis"> Overview </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/cli/" class="md-nav__link"> <span class="md-ellipsis"> CLI </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/configuration/" class="md-nav__link"> <span class="md-ellipsis"> Configuration </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/metadata/" class="md-nav__link"> <span class="md-ellipsis"> Metadata </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/metadata/optional_metadata/" class="md-nav__link"> <span class="md-ellipsis"> Optional metadata </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/oai_pmh/" class="md-nav__link"> <span class="md-ellipsis"> OAI-PMH </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/export_formats/" class="md-nav__link"> <span class="md-ellipsis"> Export formats </span> </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_7_8" > <label class="md-nav__link" for="__nav_7_8" id="__nav_7_8_label" tabindex="0"> <span class="md-ellipsis"> REST API </span> <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="2" aria-labelledby="__nav_7_8_label" aria-expanded="false"> <label class="md-nav__title" for="__nav_7_8"> <span class="md-nav__icon md-icon"></span> REST API </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../../reference/rest_api_index/" class="md-nav__link"> <span class="md-ellipsis"> Overview </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_quickstart/" class="md-nav__link"> <span class="md-ellipsis"> Quickstart </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_communities/" class="md-nav__link"> <span class="md-ellipsis"> Communities </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_drafts_records/" class="md-nav__link"> <span class="md-ellipsis"> Drafts and Records </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_groups/" class="md-nav__link"> <span class="md-ellipsis"> Groups </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_members/" class="md-nav__link"> <span class="md-ellipsis"> Members </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_requests/" class="md-nav__link"> <span class="md-ellipsis"> Requests </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_users/" class="md-nav__link"> <span class="md-ellipsis"> Users </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_reviews/" class="md-nav__link"> <span class="md-ellipsis"> Reviews </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_vocabularies/" class="md-nav__link"> <span class="md-ellipsis"> Vocabularies </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_names/" class="md-nav__link"> <span class="md-ellipsis"> Names </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_funders/" class="md-nav__link"> <span class="md-ellipsis"> Funders </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_awards/" class="md-nav__link"> <span class="md-ellipsis"> Awards </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_oaipmh_sets/" class="md-nav__link"> <span class="md-ellipsis"> OAI-PMH Sets </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_statistics/" class="md-nav__link"> <span class="md-ellipsis"> Statistics </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " 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class="md-ellipsis"> Translators guide </span> </a> </li> </ul> </nav> </li> </ul> </nav> </div> </div> </div> <div class="md-sidebar md-sidebar--secondary" data-md-component="sidebar" data-md-type="toc" > <div class="md-sidebar__scrollwrap"> <div class="md-sidebar__inner"> <nav class="md-nav md-nav--secondary" aria-label="Table of contents"> <label class="md-nav__title" for="__toc"> <span class="md-nav__icon md-icon"></span> Table of contents </label> <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix> <li class="md-nav__item"> <a href="#directory-structure" class="md-nav__link"> <span class="md-ellipsis"> Directory structure </span> </a> </li> <li class="md-nav__item"> <a href="#resource" class="md-nav__link"> <span class="md-ellipsis"> Resource </span> </a> </li> <li class="md-nav__item"> <a href="#resource-config" class="md-nav__link"> <span class="md-ellipsis"> Resource config </span> </a> </li> <li class="md-nav__item"> <a href="#instantiating-a-resource" class="md-nav__link"> <span class="md-ellipsis"> Instantiating a resource </span> </a> </li> <li class="md-nav__item"> <a href="#routing" class="md-nav__link"> <span class="md-ellipsis"> Routing </span> </a> </li> <li class="md-nav__item"> <a href="#response-serialization-content-negotiation" class="md-nav__link"> <span class="md-ellipsis"> Response serialization (content negotiation) </span> </a> </li> <li class="md-nav__item"> <a href="#parameter-parsing" class="md-nav__link"> <span class="md-ellipsis"> Parameter parsing </span> </a> <nav class="md-nav" aria-label="Parameter parsing"> <ul class="md-nav__list"> <li class="md-nav__item"> <a href="#resource-request-context" class="md-nav__link"> <span class="md-ellipsis"> Resource request context </span> </a> </li> <li class="md-nav__item"> <a href="#parsing-the-url-query-string" class="md-nav__link"> <span class="md-ellipsis"> Parsing the URL query string </span> </a> </li> <li class="md-nav__item"> <a href="#parsing-the-request-body" class="md-nav__link"> <span class="md-ellipsis"> Parsing the request body </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="#error-handling" class="md-nav__link"> <span class="md-ellipsis"> Error handling </span> </a> </li> <li class="md-nav__item"> <a href="#bootstrap" class="md-nav__link"> <span class="md-ellipsis"> Bootstrap </span> </a> </li> </ul> </nav> </div> </div> </div> <div class="md-content" data-md-component="content"> <article class="md-content__inner md-typeset"> <h1 id="building-a-resource">Building a resource<a class="headerlink" href="#building-a-resource" title="Permanent link">¶</a></h1> <p>A resource belongs to the presentation layer and is used to build REST APIs. A resource is at the core essentially a Flask Blueprint.</p> <h2 id="directory-structure">Directory structure<a class="headerlink" href="#directory-structure" title="Permanent link">¶</a></h2> <p>A resource normally split over multiple files. Below is an example of such a module structure:</p> <div class="highlight"><pre><span></span><code>|-- __init__.py |-- config.py `-- resource.py </code></pre></div> <h2 id="resource">Resource<a class="headerlink" href="#resource" title="Permanent link">¶</a></h2> <p>A basic resource is created from the Flask-Resources library, and one or more service is injected in addition to a resource config:</p> <div class="highlight"><pre><span></span><code><span class="c1"># resource.py</span> <span class="kn">from</span> <span class="nn">flask</span> <span class="kn">import</span> <span class="n">g</span> <span class="kn">from</span> <span class="nn">flask_resources</span> <span class="kn">import</span> <span class="n">Resource</span> <span class="k">class</span> <span class="nc">ClickResource</span><span class="p">(</span><span class="n">Resource</span><span class="p">):</span> <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">config</span><span class="p">,</span> <span class="n">service</span><span class="p">):</span> <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="n">config</span><span class="p">)</span> <span class="bp">self</span><span class="o">.</span><span class="n">service</span> <span class="o">=</span> <span class="n">service</span> </code></pre></div> <h2 id="resource-config">Resource config<a class="headerlink" href="#resource-config" title="Permanent link">¶</a></h2> <p>The resource config is used for dependency injection in the resource. The basics is e.g. that we allow modifying the routing for the REST API (i.e. routing is independent of implementation):</p> <div class="highlight"><pre><span></span><code><span class="c1"># config.py</span> <span class="k">class</span> <span class="nc">ClickResourceConfig</span><span class="p">(</span><span class="n">ResourceConfig</span><span class="p">):</span> <span class="c1"># Blueprint configuration</span> <span class="n">blueprint_name</span> <span class="o">=</span> <span class="s2">"click"</span> <span class="n">url_prefix</span> <span class="o">=</span> <span class="s2">"/click"</span> <span class="n">routes</span> <span class="o">=</span> <span class="p">{</span> <span class="s2">"click"</span><span class="p">:</span> <span class="s2">"/"</span><span class="p">,</span> <span class="c1"># relative to url_prefix</span> <span class="p">}</span> <span class="c1"># ...</span> </code></pre></div> <h2 id="instantiating-a-resource">Instantiating a resource<a class="headerlink" href="#instantiating-a-resource" title="Permanent link">¶</a></h2> <p>A resource needs to be instantiated first and registered on a Flask application:</p> <div class="highlight"><pre><span></span><code><span class="n">service</span> <span class="o">=</span> <span class="o">...</span> <span class="n">resource</span> <span class="o">=</span> <span class="n">ClickResource</span><span class="p">(</span><span class="n">ClickResourceConfig</span><span class="p">(),</span> <span class="n">service</span><span class="p">)</span> <span class="c1"># Register the resource as a blueprint on the Flask application.</span> <span class="n">app</span> <span class="o">=</span> <span class="n">Flask</span><span class="p">()</span> <span class="n">app</span><span class="o">.</span><span class="n">register_blueprint</span><span class="p">(</span><span class="n">resource</span><span class="o">.</span><span class="n">as_blueprint</span><span class="p">())</span> </code></pre></div> <h2 id="routing">Routing<a class="headerlink" href="#routing" title="Permanent link">¶</a></h2> <p>A resource must implement the <code>create_url_rules()</code> method to define the view routing:</p> <div class="highlight"><pre><span></span><code><span class="c1"># resource.py</span> <span class="kn">from</span> <span class="nn">flask_resources</span> <span class="kn">import</span> <span class="n">route</span> <span class="k">class</span> <span class="nc">ClickResource</span><span class="p">(</span><span class="n">Resource</span><span class="p">):</span> <span class="k">def</span> <span class="nf">create_url_rules</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="c1"># Get the named routes from the config</span> <span class="n">routes</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">config</span><span class="o">.</span><span class="n">routes</span> <span class="c1"># Define the URL rules:</span> <span class="k">return</span> <span class="p">[</span> <span class="n">route</span><span class="p">(</span><span class="s2">"POST"</span><span class="p">,</span> <span class="n">routes</span><span class="p">[</span><span class="s2">"click"</span><span class="p">],</span> <span class="bp">self</span><span class="o">.</span><span class="n">click</span><span class="p">),</span> <span class="p">]</span> <span class="k">def</span> <span class="nf">click</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="c1"># ... view implementation ...</span> </code></pre></div> <h2 id="response-serialization-content-negotiation">Response serialization (content negotiation)<a class="headerlink" href="#response-serialization-content-negotiation" title="Permanent link">¶</a></h2> <p>Content negotiation allows to support multiple different metadata formats on the same endpoint, which can also be used for versioning the REST API.</p> <p>Below is an example of how the result item from the service, is return as a dict to the response handler:</p> <div class="highlight"><pre><span></span><code><span class="c1"># resource.py</span> <span class="kn">from</span> <span class="nn">flask_resources</span> <span class="kn">import</span> <span class="n">response_handler</span> <span class="k">class</span> <span class="nc">ClickResource</span><span class="p">(</span><span class="n">Resource</span><span class="p">):</span> <span class="c1"># Decorate the view</span> <span class="nd">@response_handler</span><span class="p">()</span> <span class="k">def</span> <span class="nf">click</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="c1"># Call service</span> <span class="n">item</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">service</span><span class="o">.</span><span class="n">click</span><span class="p">(</span><span class="n">g</span><span class="o">.</span><span class="n">identity</span><span class="p">)</span> <span class="c1"># a Python dictionary is returned to the response handler which will</span> <span class="c1"># serialize it into the desired format.</span> <span class="k">return</span> <span class="n">item</span><span class="o">.</span><span class="n">to_dict</span><span class="p">(),</span> <span class="mi">200</span> <span class="c1"># HTTP 200 status code.</span> </code></pre></div> <p>The actual serialization is defined by the config (e.g. we allow users to overwrite the output of the REST API):</p> <div class="highlight"><pre><span></span><code><span class="c1"># config.py</span> <span class="kn">from</span> <span class="nn">flask_resources</span> <span class="kn">import</span> <span class="n">response_handler</span> <span class="k">class</span> <span class="nc">ClickResourceConfig</span><span class="p">(</span><span class="n">ResourceConfig</span><span class="p">):</span> <span class="n">response_handlers</span> <span class="o">=</span> <span class="p">{</span> <span class="c1"># Define JSON serializer for "application/json"</span> <span class="s2">"application/json"</span><span class="p">:</span> <span class="n">ResponseHandler</span><span class="p">(</span><span class="n">JSONSerializer</span><span class="p">())</span> <span class="p">}</span> </code></pre></div> <p>The <code>JSONSerializer</code> is responsible for turning the Python dictionary (from <code>item.to_dict()</code>) into byte string, and the <code>ResponseHandler</code> is responsible for wrappging the byte string in an HTTP response.</p> <h2 id="parameter-parsing">Parameter parsing<a class="headerlink" href="#parameter-parsing" title="Permanent link">¶</a></h2> <h4 id="resource-request-context">Resource request context<a class="headerlink" href="#resource-request-context" title="Permanent link">¶</a></h4> <p>A view method in a resource should parse all its parameters and store them on the resource request context. This way we ensure all input data have passed some basic validation.</p> <h4 id="parsing-the-url-query-string">Parsing the URL query string<a class="headerlink" href="#parsing-the-url-query-string" title="Permanent link">¶</a></h4> <p>Below is an example of parsing a required URL query string parameter <code>q</code> ( e.g. <code>/click?q=...</code>):</p> <div class="highlight"><pre><span></span><code><span class="c1"># resource.py</span> <span class="k">class</span> <span class="nc">ClickResource</span><span class="p">(</span><span class="n">Resource</span><span class="p">):</span> <span class="nd">@request_parser</span><span class="p">(</span> <span class="p">{</span><span class="s1">'q'</span><span class="p">:</span> <span class="n">ma</span><span class="o">.</span><span class="n">fields</span><span class="o">.</span><span class="n">String</span><span class="p">(</span><span class="n">required</span><span class="o">=</span><span class="kc">True</span><span class="p">)},</span> <span class="c1"># Other locations include args, view_args, headers.</span> <span class="n">location</span><span class="o">=</span><span class="s1">'args'</span><span class="p">,</span> <span class="p">)</span> <span class="nd">@response_handler</span><span class="p">()</span> <span class="k">def</span> <span class="nf">click</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="c1"># The validated data is now available on the resource request context:</span> <span class="n">resource_requestctx</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s1">'q'</span><span class="p">]</span> </code></pre></div> <h4 id="parsing-the-request-body">Parsing the request body<a class="headerlink" href="#parsing-the-request-body" title="Permanent link">¶</a></h4> <p>The HTTP request body can be parsed as well:</p> <div class="highlight"><pre><span></span><code><span class="k">class</span> <span class="nc">ClickResource</span><span class="p">(</span><span class="n">Resource</span><span class="p">):</span> <span class="nd">@request_body</span><span class="p">(</span> <span class="n">parsers</span><span class="o">=</span><span class="p">{</span> <span class="s2">"application/json"</span><span class="p">:</span> <span class="n">RequestBodyParser</span><span class="p">(</span><span class="n">JSONDeserializer</span><span class="p">())</span> <span class="p">}</span> <span class="p">)</span> <span class="nd">@response_handler</span><span class="p">()</span> <span class="k">def</span> <span class="nf">click</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="c1"># The validated data is now available on the resource request context:</span> <span class="n">resource_requestctx</span><span class="o">.</span><span class="n">data</span> </code></pre></div> <h2 id="error-handling">Error handling<a class="headerlink" href="#error-handling" title="Permanent link">¶</a></h2> <p>The resource further allows you to easily map service layer errors to an HTTP error. Below is an example of mapping the <code>AlreadyClickedError to an</code>400`` Bad Request HTTP error:</p> <div class="highlight"><pre><span></span><code><span class="c1"># resource.py</span> <span class="kn">from</span> <span class="nn">flask_resources</span> <span class="kn">import</span> <span class="n">Resource</span><span class="p">,</span> <span class="n">HTTPJSONException</span><span class="p">,</span> <span class="n">create_error_handler</span> <span class="kn">from</span> <span class="nn">..service.errors</span> <span class="kn">import</span> <span class="n">AlreadClickedError</span> <span class="k">class</span> <span class="nc">ClickResource</span><span class="p">(</span><span class="n">Resource</span><span class="p">):</span> <span class="c1"># Set the error handlers to map service errors to HTTP errors.</span> <span class="n">error_handlers</span> <span class="o">=</span> <span class="p">{</span> <span class="n">AlreadyClickedError</span><span class="p">:</span> <span class="n">create_error_handler</span><span class="p">(</span> <span class="n">HTTPJSONException</span><span class="p">(</span> <span class="n">code</span><span class="o">=</span><span class="mi">400</span><span class="p">,</span> <span class="n">description</span><span class="o">=</span><span class="s2">"Already clicked."</span><span class="p">,</span> <span class="p">)</span> <span class="p">)</span> <span class="p">}</span> </code></pre></div> <h2 id="bootstrap">Bootstrap<a class="headerlink" href="#bootstrap" title="Permanent link">¶</a></h2> </article> </div> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> </main> <footer class="md-footer"> <nav class="md-footer__inner md-grid" aria-label="Footer" > <a href="../../best-practices/ui/" class="md-footer__link md-footer__link--prev" aria-label="Previous: User interface"> <div class="md-footer__button md-icon"> <svg 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