具有has_many的模型到彼此-如何在具有特定其他模型的地方查找模型？

Question

Tables:

Sales, Types, SaleTypes.

Sales has_many SaleTypes, has_many Types through SalesTypes. Types has_many SaleTypes, has_many Sales through SalesTypes.

I want to find all Sales where Types.id == 1 OR is in [1, 2, 3].

So far the best solution is to do:

Sale.joins(:sale_types).where('sale_types.type_id = ?', '1')

However, this seems unwieldy and it does not accept arrays/multiple matches. Is there a better way to do this?

Answer 1

Doing join is the best way i can think of. Do this if you want to select sales based on multiple types

Sale.joins(:sale_types).where('sale_types.type_id in (?)', types)