Rails has_many_through迁移

我正在为以下模型创建一个many_to_many关联:

I'm creating a many_to_many association for the following models:

class Competence < ActiveRecord::Base
    has_many :behaviour, through: :behaviours_rel
    has_many :stabilizer, through: :stabilizers_rel
end

class Behaviour < ActiveRecord::Base
    belongs_to :competence
end

class Stabilizer < ActiveRecord::Base
    belongs_to :competence
end

我相信我必须做类似的事情:

I believe I have to do something like:

rails generate migration behaviour:belongs_to 

但是它不起作用.我简直无法理解使用rails generate进行这种迁移的逻辑.

but it doesn't work. I simply can't get the logic of doing this migration with rails generate.

我正在尝试保留几种行为，以至于one_to_many关系还不够.

I'm trying to save in a competence several behaviours so a one_to_many relationship is not enough.

顺便说一句，我不想​​用sql表显式地完成它.

By the way, I don't want to do it explicitly with sql table.