Rails加入多个关联搜索查询

Question

I have two models say User and Roles

Lets say I have 3 users "A", "B" and "C" and I have 3 roles "X", "Y", "Z" and the relation for users is has_many roles

Lets assume A have role X, B have X and Y and C have role X

How should I modify my query to get B alone which have both X and Y role

This is my query which returns users with either X or Y

User.joins(:roles).where("roles.name IN (?)", ["X", "Y"])

Answer 1

I think work will on after implement below query, I just seeing your code & implemented.

User.joins("LEFT JOIN roles ON roles.name = name").where(["name = 'X', 'Y'"])

Note: Not tested