How do I find a child given two parent_ids in Rails?

I am not entirely sure how to word this question, but here goes:

I am trying to find all entries in a table given two parent variables.

So,

father has_many :children
mother has_many :children
child belongs_to :father
child belongs_to :mother

Now, how might I find all children based on a specific father and mother?

If I left out important information,开发者_如何学运维 please let me know. Otherwise, I greatly appreciate any help in figuring this out.

Use this:

Child.find_all_by_father_id_and_mother_id(father.id, mother_id)

Here are a few ways:

@children = Child.where(:mother_id => mother.id, :father_id => father.id).all

or if you've already loaded the children:

@children = mother.children & father.children