I am running in to a problem while using find_or_create_by
on a has_many
through
association.
class Permission < ActiveRecord::Base
belongs_to :user
belongs_to :role
end
class Role < ActiveRecord::Base
# DB columns: user_id, role_id
has_many :permissions
has_many :users, :through => :permissions
end
class User
has_many :permissions
has_many :roles, :through => :permissions
end
Rails throws an error when I invoke find_or_create_by
on roles
association of a User
object.
u = User.first
u.roles.find_or_create_by_rolename("admin")
# Rails throws the following error
# NoMethodError: undefined method `user_id=' for #<Role id: nil, rolename: nil,
# created_at: nil, updated_at: nil>
I was able to work around the problem by changing my code as follows:
unless u.roles.exists?(:rolename => "admin")
u.roles << Role.find_or_create_by_rolename("admin")
end
I am curious to find if find_or_create_by
works with has_many
through
associations.
It works, but not with :through
.
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