Question

我有3张桌子：

用户类

 User has_many :project_assignments
 User has_many :projects, through: :project_assignments

ProjectAssignment类

 ProjectAssignment  belongs_to :user
 ProjectAssignment  belongs_to :project_owner, class_name: 'User', foreign_key: 'user_creator_id' 
 ProjectAssignment  belongs_to :project

项目

has_many :project_assignments
has_many :users, through: :project_assignments

ProjectAssignment包含以下列：

 project_id, user_id, creator_user_id

我想通过creator_user_id

为用户获取所有项目

ex：current_user.created_projects

查询：ProjectAssignment.where（creator_user_id：current_user.id）

在定义模型中的关系时可以这样做，就像我对projects所做的那样，但foreign_key应该是creator_user_id

Answer 1

我认为你只需要在User中使用另外两个关联来利用creator_user_id字段（而不是user.projects将返回用户所属的项目）

试试这个 -

#in User class
has_many :owned_project_assignments, :class_name => "ProjectAssignment", :as => :project_owner, :foreign_key => "user_creator_id"
has_many :owned_projects, :through => owned_project_assignments, :class_name => "Project", :source => :project, :as => :project_owner

：来源和：因为选项可能有点棘手，所以这可能不起作用，它只是我的头顶......

Answer 2

在我的情况下，这是正确的解决方案：

 has_many :owned_project_assignments, class_name: "ProjectAssignment", foreign_key: 'user_creator_id'
 has_many :owned_projects, through: :owned_project_assignments, source: :project

通过多对多关系获取数据

2 个答案: