View Source Ash.Query.Parent (ash v2.6.0)
true if the provided field is nil Used to access values from the "source" of a given expression.
This is used in cases where expressions are given for some relationship path, for example:any()
has_many :foo, Foo do filter expr(priority == :foo and type == parent(foo_type)) end
This is supported on a case by case basis by a given data layer and in specific usages.