django-rest-caller 0.1.5

templatetag to call an urlconf and store its payload into the template context

django-rest-caller

Simple django templatetag for calling an urlconf view endpoint.

Limitations

• it works only for GET methods
• it doesn't handle request without a body
• it doen't play nice with login required views (it assumes that the caller handles everything it is required to access the endpoint)
• it assumes that the endpoint returns a json

Installation

Install with pip

    $ python3 -m pip install django-rest-caller

Add caller.apps.CallerConfig to INSTALLED_APPS

    INSTALLED_APPS = [
        ...
        'caller.apps.CallerConfig',
        ...
    ]

Usage

call

In your template load the templatetag

    {% load caller_tags %}

and use the call tag as

    {% call 'urlconf' arg1=42 arg2='X' with param1='1' param2='2' as 'object_name' %}

or

    {% call 'urlconf' 42 'X' with param1='1' param2='2' as 'object_name' %}

• 'urlconf' arg1=42 arg2='X' this is the usual {% url %} parameters (remember: use args parameter list or kwargs parameters, not both)
• param1='1' param2='2' these parameters will be converted to GET querystring
• as 'object_name' store the called object into object_name object. It can be a string or a variable name.

so the called url is equivalent to

    {% url 'urlconf' arg1=42 arg2='X' %}?param1=1&param2=2

The call will inject the result json object into the template context, so you can

• use as context object

    {% load caller_tags %}

    {% call 'api:blog-list' as 'posts' %}
    {% for post in posts %}
    <div>
    <h2>{{ post.title }}</h2>
    <p>{{ post.body }}</p>
    </div>
    {% endfor %}

• feeding to json tag

    {% load caller_tags %}

    {% call 'api:blog-list' as 'posts' %}
    {{ posts|json_script:"posts-data" }}
    <script>
        function get_json(node) {
          var el = document.getElementById(node);
          return JSON.parse(el.textContent || el.innerText);
        }
        var posts = get_json("posts-data");
        console.log(posts);
    </script>

json_script

This tag will backport the django >= 2.1 json_script filter, which safely outputs a Python object as JSON, wrapped in a <script> tag, ready for use with JavaScript.

example

with

    value = {'hello': 'world'}

and

    {{ value|json_script:"hello-data" }}

will output

    <script id="hello-data" type="application/json">{"hello": "world"}</script>

and can be retrieved with

    function get_json(name) {
      var el = document.getElementById(name);
      return JSON.parse(el.textContent || el.innerText);
    }
    var data = get_json("hello-data");
    console.log(data);

Changes

0.1.5

• proper url unquote arg parameters
• can use templatefilters in templatetag parameters

0.1.4

• show raised exception in called view instead of a generic one

0.1.3

• always require as 'varname'
• be able to use args or kwargs for urlconf as documented
• update documentation

0.1.1 - 0.1.2

• update documentation

0.1.0

• initial release