INTRODUCTION
------------

Twig Field Value allows Drupal themers to print field labels and field values
individually. It provides two Twig filters one that print a field label and
one that prints field value(s).

Filters:
- field_label :         Returns the field label value.
- field_value :         Returns the render array of the field value(s) without
                        the field wrappers.
- field_raw :           Returns raw field properties value(s).
- field_target_entity : Returns the referenced entity object(s) of an entity
                        reference field.

USAGE
-----

To print the label and value of a field:
  <strong>{{ content.field_name|field_label }}</strong>:
      {{ content.field_name|field_value }}

To print the label and values of a field with multiple values:
  <strong>{{ content.field_name|field_label }}</strong>:
      {{ content.field_name|field_value|safe_join(', ') }}

To print image link and the alt text of an image:
  <img src={{ file_url(content.field_image|field_target_entity.uri.value) }}
    alt={{ content.field_image|field_raw('alt') }} />

To print content of multiple referenced items.
  <ul>
    {% if content.field_tags.1 %}
      {% for item in content.field_tags | field_target_entity %}
        <li>{{ item.id }}</li>
      {% endfor %}
    {% else %}
      <li>{{ item.id }}</li>
    {% endif %}
  <ul>

The above examples assume that 'content.field_example' is the render array of
the of a field, as for example in a node template.

IMPORTANT CACHING NOTICE
------------------------

When you print data of referenced entities the cache data of that entity is
ignored. The cache will not be invalidated when the referenced entity changes.

To compensate, render the field without printing the output. The rendering makes
sure that the cache metadata is captured and applied to the output.

{{ content.field_referenced_entity|field_target_entity.label }}
{% set dummy = content.field_referenced_entity|render %}

KNOW RESTRICTIONS
-----------------

The field_raw twig filter does not support access control at field item level
for entity reference fields. The render array allows access control to
individual field items by using #access = FALSE. But the filter can not apply
this restriction to individual referenced entities.

The field_target_entity twig filter does not support access control at field
item level. The render array allows access control to individual field items
by using #access = FALSE. But the field_target_entity filter can not apply this
restriction to individual referenced entities.

AUTHOR
------
Erik Stielstra (Sutharsan, https://www.drupal.org/u/sutharsan)