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ошибся малость
User
has_many :lists
has_many: films, through: :list
List
belongs_to :user
belongs_to :film
Film
has_many :lists
has_many: users, through: :list
User
has_many :lists
has_many: films, through: :list
List
belongs_to :user
belongs_to :film
Film
has_many :lists
has_many: users, through: :list
