Ruby on Rails

Hi,
I have three model subject, document_types and document.

class Subject < AR
has_many :documents
end

class DocumenType < AR
has_many :documents
end

class Document < AR
belongs_to :subject
belongs_to :document_types
end

I need to list all the documents under a subject order by
document_type's start_date.
What is exact syntax I will use in this association to solve this
problem.

Thanks in advance.

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