Rails - Feb 2009 - has_and_belongs_to_many

Hi
     I have the models

1)CompanyRequest
     has_many :contacts
2)Contact
   belongs_to :company_request
   has_and)_belongs_to_many :roles
3)Role
  has_and)_belongs_to_many :contacts

   and the join table contact_roles containg role_id,contact_id

    I have to find out the primary contact(ie contact with role_id = 1
)corresponding to a request

        Could you please help me to solve this?

Thanks in advance
Sijo
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