Add data filter for use in templates

Closes #5395

rest_framework/templates/rest_framework/docs/document.html

@@ -13,8 +13,8 @@
     {% if 'javascript' in langs %}{% include "rest_framework/docs/langs/javascript-intro.html" %}{% endif %}
 </div>
 </div>
-{% if document.data %}
+{% if document|data %}
-{% for section_key, section in document.data|items %}
+{% for section_key, section in document|data|items %}
 {% if section_key %}
     <h2 id="{{ section_key }}" class="coredocs-section-title">{{ section_key }} <a href="#{{ section_key }}"><i class="fa fa-link" aria-hidden="true"></i>
 </a></h2>

rest_framework/templates/rest_framework/docs/sidebar.html

@@ -5,8 +5,8 @@
     <i class="fa fa-bars fa-2x toggle-btn" data-toggle="collapse" data-target="#menu-content"></i>
     <div class="menu-list">
         <ul id="menu-content" class="menu-content collapse out">
-            {% if document.data %}
+            {% if document|data %}
-            {% for section_key, section in document.data|items %}
+            {% for section_key, section in document|data|items %}
             <li data-toggle="collapse" data-target="#{{ section_key }}-dropdown" class="collapsed">
                 <a><i class="fa fa-dot-circle-o fa-lg"></i> {% if section_key %}{{ section_key }}{% else %}API Endpoints{% endif %} <span class="arrow"></span></a>
                 <ul class="sub-menu {% if section_key %}collapse{% endif %}" id="{{ section_key }}-dropdown">

rest_framework/templatetags/rest_framework.py

@@ -245,6 +245,20 @@ def items(value):
     return value.items()
 
 
+@register.filter
+def data(value):
+    """
+    Simple filter to access `data` attribute of object,
+    specifically coreapi.Document.
+
+    As per `items` filter above, allows accessing `document.data` when
+    Document contains Link keyed-at "data".
+
+    See issue #5395
+    """
+    return value.data
+
+
 @register.filter
 def schema_links(section, sec_key=None):
     """

tests/conftest.py

@@ -27,7 +27,7 @@ def pytest_configure():
                 'BACKEND': 'django.template.backends.django.DjangoTemplates',
                 'APP_DIRS': True,
                 'OPTIONS': {
-                    "debug": True,  # We want template errors to raise
+                    "debug": True,  # We want template errors to raise
                 }
             },
         ],