[ACCEPTED]-Using a scope from a related model in another scope-activerecord

Accepted answer

Score: 55

Try this:

scope :engine_parts, lambda { joins(:part_category).merge(PartCategory.engine) }

Basically, the result of joins(:part_category) is the 3 join of two models, so you can't call .engine on 2 it directly, you need to compose scopes 1 in this manner.

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Source: stackoverflow.com

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