Reference field option limit
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This module allows reference fields of several types to have their widgets' available options limited by the values of other fields in the current entity.
This is best illustrated by examples:
Example 1: countries and cities
Suppose you want to label articles (or products, or businesses, etc) by both city and country so both can be used for filtering and searching. You could use a hierarchical taxonomy with city terms as children of country terms, but that doesn't make sense when you come to set up Views filters.
