Activerecode HABTM 主键问题

Question

我必须使用具有多对多关系的表。我已经创建了正确的表 codesecure_project_tst_definition 并且它可以工作。我可以通过在 TstDefinition 对象上调用 codesecure_projects

我已经在下面发布了迁移

class CreateCodesecureProjects < ActiveRecord::Migration
  def self.up
    create_table :codesecure_projects do |t|
      t.string :name
      t.string :lang

      t.timestamps
    end
  end

  def self.down
    drop_table :codesecure_projects
  end
end


class CreateTstDefinitions < ActiveRecord::Migration
  def self.up
    create_table :tst_definitions do |t|
      t.string :test_name

      t.timestamps
    end
  end

  def self.down
    drop_table :tst_definitions
  end
end


class CreateCodesecureProjectsTstDefinitions < ActiveRecord::Migration
  def self.up
    create_table :codesecure_projects_tst_definitions do |t|
      t.references :codesecure_project
      t.references :tst_definition

      t.timestamps
    end
  end

  def self.down
    drop_table :codesecure_projects_tst_definitions
  end
end

模型的相关部分：

class TstDefinition < ActiveRecord::Base
  has_and_belongs_to_many :codesecure_projects
  has_many :tst_datas 

class CodesecureProject < ActiveRecord::Base
  has_many :input_abstractions
  has_and_belongs_to_many :tst_definitions

Answer 1

经过一番搜索，我实际上找到了答案，感谢这篇博文http://jimcortez.com/blog/?p=9。我只需要从 codesecure_projects_tst_definitions 表中删除 id 列。所以迁移现在看起来像这样：

class CreateCodesecureProjectsTstDefinitions < ActiveRecord::Migration
  def self.up
    create_table :codesecure_projects_tst_definitions, :id => false do |t|
      t.references :codesecure_project
      t.references :tst_definition

      t.timestamps
    end
  end

  def self.down
    drop_table :codesecure_projects_tst_definitions
  end
end