我有两个模型Destination和Package。包可能有多个目标,而目标可能包含多个包。为了维护关系,我有一个名为packages_in_destinations的表。虽然我尝试在活动管理员中从包表单插入目标,但它不会显示任何错误,但packages_in_destinations表不会更新。我正在使用MySQL作为数据库。
# app/admin/package.rb
ActiveAdmin.register Package do
permit_params :package_id, :package_title, :description, :featured_image, :duration, :meta_description, :meta_keywords, :published, :package_categories_id, :destinations_id
form do |f|
f.semantic_errors *f.object.errors.keys
f.inputs "Package Details" do
f.input :destination_id, :as => :check_boxes, :collection => Destination.all.collect {|destination| [destination.destination_title, destination.id]}
end
f.actions
end
end
# app/models/package.rb file
class Package < ApplicationRecord
validates_uniqueness_of :package_title, scope: :package_title
validates :package_title, :description, :package_categories_id, :presence => true
belongs_to :package_category
has_and_belongs_to_many :packages_in_destinations
has_many :destinations, through: :packages_in_destinations
end
# app/models/destination.rb file
class Destination < ApplicationRecord
validates_uniqueness_of :destination_title, scope: :destination_title
validates :destination_title, :description, :altitude, :geolocation, :presence=>true
has_and_belongs_to_many :packages_in_destinations
has_many :packages, through: :packages_in_destinations
end
# app/models/packages_in_destination.rb
class PackagesInDestination < ApplicationRecord
has_and_belongs_to_many :destinations, foreign_key: :destination_id, class_name: 'Destination'
has_and_belongs_to_many :packages, foreign_key: :package_id, class_name: 'Package'
end
已从迁移文件
创建了两个表之间的关系class CreatePackagesInDestinations < ActiveRecord::Migration[5.0]
def up
create_join_table :packages, :destinations, table_name: :packages_in_destinations do |t|
t.index :package_id
t.index :destination_id
t.timestamps
end
def down
drop_table :packages_in_destinations
end
end
创建另一个迁移文件以将主键添加到表
class AddingPrimaryInPackaesInDestination < ActiveRecord::Migration[5.0]
def change
add_column :packages_in_destinations, :id, :primary_key
end
end
因此从所有这些事情中都没有显示错误,但是包保存在包表中但在packages_in_destinations
表中没有插入关系。请某人提出遗漏的内容以及这些内容有什么问题?
答案 0 :(得分:1)
您需要使用has_and_belongs_to_many
或has_many :through
。不要同时使用两者。
1)has_and_belongs_to_many
的示例。在这种情况下,您可以删除PackagesInDestination
型号:
# app/models/package.rb file
class Package < ApplicationRecord
# ...
has_and_belongs_to_many :destinations, join_table: :packages_in_destinations
end
# app/models/destination.rb file
class Destination < ApplicationRecord
# ...
has_and_belongs_to_many :packages, join_table: :packages_in_destinations
end
# app/models/packages_in_destination.rb
# removed
2)has_many :through
的示例:
# app/models/package.rb file
class Package < ApplicationRecord
# ...
has_many :packages_in_destinations
has_many :destinations, through: :packages_in_destinations
end
# app/models/destination.rb file
class Destination < ApplicationRecord
# ...
has_many :packages_in_destinations
has_many :packages, through: :packages_in_destinations
end
# app/models/packages_in_destination.rb
class PackagesInDestination < ApplicationRecord
belongs_to :destination
belongs_to :package
end