filter

See also

is_visible, is_a, exclude

Filters a list on the value of a property, either on presence or equality.

Testing presence

To filter a list of values:

{% print somelist|filter:<code>p</code> %}

Results in a list where all elements have the property p defined and where the property (after conversion to boolean) is true.

This can be used to filter a list of resource ids on the presence of a property. For example, to see all published elements in a list of resource ids:

{% print [1,2,3,4,5,6]|filter:<code>is_published</code> %}

To find all pages from page connection hasdocument that have an image:

{% print id.o.hasdocument|filter:<code>depiction</code> %}

Testing equality

A second argument can be added to test on equality:

{% print somelist|filter:<code>title</code>:"Untitled" %}

Shows all elements whose title property is “Untitled”.