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Active Record Associations
def partner has_many :centers end def center has_and_belongs_to_many :classes belongs_to :partner end def fpclass has_and_belongs_to_many :centers end
- I'd like to access all
fpclassesthat partner belongs to? ( Is there any other way to access except to provide another foreign key named
partner_idon fpclass ) Any ideas really helpful.
You should be able to do this:
class Partner has_many :centers has_many :classes, through: :centers end
Which Rails will know how to query based upon the other associations in the Center class. It basically compiles those associations together into the proper joins for you when you use the
through option. You might have to tweak this a little bit for any class names or whatever that don't match up directly, but that should do the trick for you.
I agree with Chris. I ran into similar use cases using HABTM but ended up using has many through as an alternative. It was a much cleaner option for me.