group_by
Groups items of a list by a property.
An item can be an id, a proplist or a map.
When the item is an integer then it is assumed to be the id of a resource.
This is especially useful for grouping items in for-loops.
For example:
{% for grp in value|group_by:"a" %} ... loop over grp ... {% endfor %}When value is the three element list:
[
[{a, 1}, {b, 1}],
[{a, 1}, {b, 2}],
[{a, 2}, {b, 3}]
]then the output of group_by “a” will be the two element list:
[
[ [{a, 1}, {b, 1}], [{a, 1}, {b, 2}] ],
[ [{a, 2}, {b, 3}] ]
].