drupal twig cheat sheet

cheat_sheet.twig

#sources 
# https://www.drupal.org/docs/contributed-modules/twig-tweak-2x/cheat-sheet
# https://straightupcraft.com/articles/how-to-check-if-a-variable-or-value-exists-using-twig

# Render a view
  {{ drupal_view('who_s_new', 'block_1') }}

# Get the result of a view
  {{ drupal_view_result('who_s_new', 'block_1') }}


# Render a Plugin Block
  {{ drupal_block('plugin_id') }}
# you can get a list of plug in IDs using drush
# $ drush ev "print_r(array_keys(\Drupal::service('plugin.manager.block')->getDefinitions()));"
# Examples:
  {{ drupal_block('system_breadcrumb_block') }}
  {{ drupal_block('views_block:view_name-display_machine_name') }}
  {{ drupal_block('views_exposed_filter_block:view_name-display_machine_name') }}


# Render a Configuration Entity Block
  {{ drupal_entity('block', 'block_id') }}
# The following Drush command will list all available block entities.
# drush ev 'print_r(\Drupal::configFactory()->listAll("block.block."));'

# Render a Content Entity Block
  {{ drupal_entity('block_content', 'content_block_id') }}
# Getting content block IDs is as simple as executing a single SQL query.
# drush sqlq 'SELECT id, info FROM block_content_field_data'


# Render a field
  {{ node.field_xxxx.value }}
  {{ order_entity.field_xxxx.value }}

# Conditions - Does evelate to TRUE?
    {% if order_entity.field_external_id.value %}
      {{ 'Order exported with ID'|t }}  {{ order_entity.field_external_id.value }}
    {% else %}
      {{ 'Order was not exported'|t }} 
    {% endif %}

# Conditions - Works on node fields (tested)
    {% if content.field_some_test_field[0] is not empty %}
     {{ content.field_some_test_field }}
    {% endif %}
    
    
# Conditions - Does evelate to TRUE?
    {% if online == false %}
      <p>Our website is in maintenance mode. Please, come back later.</p>
    {% endif %}
    
# Specific/Typed checkes
    
# is defined
  {% if foo is defined %}
      {{ 'The Foo var exists (is defined) ' }}
  {% endif %}

# is null
  {% if foo is null %}
      {{ 'The Foo var is not null. if it did not exist we would get an error' }}
  {% endif %}


# is not empty	
  {% if foo is not empty %}
      {{ 'foo is not empty in the following cases: any string, any number including 0, Boolean TRUE' }}
      {{ 'foo is empty in the following cases: empty string, Boolean FALSE, null' }}
      {{ 'Will error if does not exist' }}
  {% endif %}
  
# For more specific cases check https://straightupcraft.com/articles/how-to-check-if-a-variable-or-value-exists-using-twig  


# Debug a variable: exposed_form_style_classes 
{{ dump(exposed_form_style_classes) }}

template_names

views-exposed-form--{view-name}--{display-name}.html.twig