Trying to get an value from a DataMapper join table and association?

Without changing any of your code, you should be able to do: mix_clip = clip. Mix_clips. First(:mix => mix, :clip => clip) to get at the join record associated with your specific mix and clip resources Currently, there's a bug in DM that makes it kinda unreliable to do the following without any additional measures: mix_clip = clip.

Mix_clips. Get(mix. Id, clip.Id) This is because DM forgets the order in which relationships have been defined, and thus cannot currently know reliably in which order the get method should accept the primary key components You can work around this by defining the foreign key properties explicitly in your join model, like so (note that you still have to declare the relationships explicitly, of course): class MixClip include DataMapper::Resource property :id, Serial property :order, Integer property :mix_id, Integer, :key => true property :clip_id, Integer, :key => true belongs_to :mix belongs_to :clip end This will make sure that DM knows that get accepts the primary key as (mix_id, clip_id) so you're now able to call mix_clip = clip.

Mix_clips. Get(mix.Id, clip. Id) A reason for wanting to do that is that calls to get take the identity map into account, which, based on your access characteristics, might be able to yield better performance.

Without changing any of your code, you should be able to do: mix_clip = clip. Mix_clips. First(:mix => mix, :clip => clip) to get at the join record associated with your specific mix and clip resources.

Currently, there's a bug in DM that makes it kinda unreliable to do the following without any additional measures: mix_clip = clip. Mix_clips. Get(mix.Id, clip.

Id) This is because DM forgets the order in which relationships have been defined, and thus cannot currently know reliably in which order the . Get method should accept the primary key components. You can work around this by defining the foreign key properties explicitly in your join model, like so (note that you still have to declare the relationships explicitly, of course): class MixClip include DataMapper::Resource property :id, Serial property :order, Integer property :mix_id, Integer, :key => true property :clip_id, Integer, :key => true belongs_to :mix belongs_to :clip end This will make sure that DM knows that .

Get accepts the primary key as (mix_id, clip_id) so you're now able to call mix_clip = clip. Mix_clips. Get(mix.

Id, clip. Id) A reason for wanting to do that is that calls to . Get take the identity map into account, which, based on your access characteristics, might be able to yield better performance.

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