在主题讨论的上下文中,我希望允许用户报告令人反感的评论。我有一个“报告”表,我要在其中记录撰写评论的用户和提出投诉的用户。
“我的报告”表当前如下:
create_table "reports", force: :cascade do |t|
t.bigint "comment_id"
t.bigint "user_id"
t.integer "author_id"
t.text "body"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.index ["comment_id"], name: "index_reports_on_comment_id"
t.index ["user_id"], name: "index_reports_on_user_id"
end
user_id
记录投诉用户的ID。 author_id
记录评论作者的ID。
关联设置如下:
report.rb
class Report < ApplicationRecord
belongs_to :comment
belongs_to :user
belongs_to :author, class_name: 'User', foreign_key: 'author_id'
end
user.rb
class User < ApplicationRecord
# Nothing yet, but presumably need something
end
在控制台中,我可以查询如下:
r = Report.last
=> #<Report id: ...
r.user
=> #<User id: ...
但我无法查询
r.author
=> NoMethodError: undefined method `author' for #<Report:0x000000082ef588>
第一个问题是如何启用这种查询。
第二,我希望能够查询针对特定用户的投诉(报告),所以:
u = User.last
=> #<User id: ...
u.complaints
=> #<ActiveRecord::AssociationRelation [...
我还需要添加什么来启用这些查询?
答案 0 :(得分:2)
class Report < ApplicationRecord
belongs_to :comment
belongs_to :user
belongs_to :author, class_name: 'User', foreign_key: 'author_id'
end
class User < ApplicationRecord
# Nothing yet, but presumably need something
has_many :reports #user reports
#Query the complaints (Reports) made against particular Users
has_many :complaints, class_name: 'Report', foreign_key: 'author_id'
end