Getting a list of related models in rails

Suppose I have an object Person开发者_JS百科, which has_many :foos and :bars.

Given an instance, p (p = Person.new), how do I programmatically determine what relationships are available?

i.e. p.some_method => ["foo", "bar"]

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You can use Active Record Reflections (API here)

In your example:

p.class.reflect_on_all_associations(:has_many).collect {|a| a.name}