[英]Rails HABTM has_many destroy error
I have a has_and_belongs_to_many using has_many between users and workspaces. 我有一个has_and_belongs_to_many在用户和工作区之间使用has_many 。
user.rb user.rb
class User < ActiveRecord::Base
has_many :user_workspaces, dependent: :destroy
has_many :workspaces, through: :user_workspaces
before_destroy :delete_workspaces
def delete_workspaces
self.workspaces.each(&:destroy)
end
workspace.rb workspace.rb
class Workspace < ActiveRecord::Base
has_many :user_workspaces
has_many :users, through :user_workspaces
end
user_workspaces class and migration: user_workspaces类和迁移:
class UserWorkspace < ActiveRecord::Base
self.table_name = "user_workspaces"
belongs_to :user
belongs_to :workspace
end
class CreateUsersAndWorkspaces < ActiveRecord::Migration
def change
create_table :users_workspaces, id: false do |t|
t.belongs_to :user, index: true
t.belongs_to :workspace, index: true
t.boolean :admin, default: true
end
end
end
class RenameUsersWorkspaces < ActiveRecord::Migration
def change
rename_table('users_workspaces', 'user_workspaces')
end
end
I want this both test to pass: 我希望这两个测试都通过:
should "destroy all associatios and objects" do
user = User.create!(attributes_for(:user))
w = user.workspaces.create!(attributes_for(:workspace))
user.destroy
assert UserWorkspace.all.empty? #asser there are no associations
end
which gives me the error 这给了我错误
ActiveRecord::StatementInvalid: SQLite3::SQLException: no such column: user_workspaces.: DELETE FROM "user_workspaces" WHERE "user_workspaces"."" = ? ActiveRecord :: StatementInvalid:SQLite3 :: SQLException:否这样的列:user_workspaces .:从“ user_workspaces”中删除“ user_workspaces”。“” =?
should "destroy association when destroying workspace" do
user = User.create!(attributes_for(:user))
w = user.workspaces.create!(attributes_for(:workspace))
w.destroy
assert UserWorkspace.all.empty?
end
How can I cover both scenarios? 如何涵盖这两种情况? destroying an user destroys the association and the workspaces, destroying the workspace also destroys the association 销毁用户会销毁关联和工作区,销毁工作区也会销毁关联
According to http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html just need to ignore the join table. 根据http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html,只需忽略连接表即可。
Workspace.rb now has dependent destroy, to destroy only the join (intended behavior of destroy) Workspace.rb现在具有从属销毁,仅销毁联接(销毁的预期行为)
has_many :users, through: :user_workspaces,
inverse_of: :workspaces,
dependent: :destroy
then user.rb keeps the delete_workspaces functions, but adds dependent: :destroy, to also destroy the association. 然后user.rb保留delete_workspaces函数,但添加dependent::destroy也破坏该关联。
user.rb user.rb
before_destroy: :delete_workspaces
has_many :workspaces, through: :user_workspaces,
dependent: :destroy
def delete_workspaces
self.workspaces.each(&:destroy)
end
now both test passes. 现在两个测试都通过了。
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