vendor/twig/twig/doc/filters/merge.rst

   1 ``merge``
   2 =========
   3
   4 The ``merge`` filter merges an array with another array:
   5
   6 .. code-block:: jinja
   7
   8     {% set values = [1, 2] %}
   9
  10     {% set values = values|merge(['apple', 'orange']) %}
  11
  12     {# values now contains [1, 2, 'apple', 'orange'] #}
  13
  14 New values are added at the end of the existing ones.
  15
  16 The ``merge`` filter also works on hashes:
  17
  18 .. code-block:: jinja
  19
  20     {% set items = { 'apple': 'fruit', 'orange': 'fruit', 'peugeot': 'unknown' } %}
  21
  22     {% set items = items|merge({ 'peugeot': 'car', 'renault': 'car' }) %}
  23
  24     {# items now contains { 'apple': 'fruit', 'orange': 'fruit', 'peugeot': 'car', 'renault': 'car' } #}
  25
  26 For hashes, the merging process occurs on the keys: if the key does not
  27 already exist, it is added but if the key already exists, its value is
  28 overridden.
  29
  30 .. tip::
  31
  32     If you want to ensure that some values are defined in an array (by given
  33     default values), reverse the two elements in the call:
  34
  35     .. code-block:: jinja
  36
  37         {% set items = { 'apple': 'fruit', 'orange': 'fruit' } %}
  38
  39         {% set items = { 'apple': 'unknown' }|merge(items) %}
  40
  41         {# items now contains { 'apple': 'fruit', 'orange': 'fruit' } #}