has-and-belongs-to-many

问题 Have looked through and tried most examples and still cannot create a working HABTM . No matter how the CaseTrack and CaseTrackValue factories are constructed, I'm not able to find the CaseTrackValue[] in CaseTrack. Shouldn't creating CaseTrack properly provide a CaseTrackValue param within CaseTrack. BTW: the only working association for HABTM seems to be putting case_track_values { |a| [a.association(:case_track_value)] } in CaseTrack. class CaseTrack has_and_belongs_to_many CaseTrackValue

问题 I have two tables: categories and videos , I then have a pivot table for these as it's a belongsToMany relationship. What I'm trying to do is get all of the videos where there isn't a single instance of the video being in one of many categories. e.g. Video 1 is in category 1, 2 and 3. Video 2 is in category 1 and 3. Video 3 is in category 1. I want to get the video which is NOT in category 2 or 3, meaning this will return Video 3. What I've tried so far, which doesn't give the intended result

问题 I've spent three days working this issue but has come to a dead end and can't proceed. I know how to get the needed data using non cakephp methods, but I prefer to use cakephp's model relation. MY MODELS class User extends AppModel { var $hasOne = 'Profile'; } class Profile extends AppModel { var $belongsTo = 'User'; var $hasAndBelongsToMany = array('Quad' => array('className' => 'Quad')); } class Quad extends AppModel{ var $belongsTo = 'User'; var $hasAndBelongsToMany = array ('Performer' =>

问题 I have a site develop in cakephp 2.0 I want to make a HABTM relation to the same model: A product can has more products. I thinked to do in this mode into my model: class Product extends AppModel { public $name = 'Product'; public $useTable = 'products'; public $belongsTo = 'User'; public $actsAs = array('Containable'); public $hasAndBelongsToMany = array( 'Ingredient' => array( 'className' => 'Product', 'joinTable' => 'ingredients_products', 'foreignKey' => 'product_id',

问题 I have a site develop in cakephp 2.0 I want to make a HABTM relation to the same model: A product can has more products. I thinked to do in this mode into my model: class Product extends AppModel { public $name = 'Product'; public $useTable = 'products'; public $belongsTo = 'User'; public $actsAs = array('Containable'); public $hasAndBelongsToMany = array( 'Ingredient' => array( 'className' => 'Product', 'joinTable' => 'ingredients_products', 'foreignKey' => 'product_id',

问题 I have two models, called Book and Tag, which are in a HABTM relationship. I want a couple (book, tag) to be saved only once. In my models I have var $hasAndBelongsToMany = array( 'Tag' => array( 'className' => 'Tag', 'joinTable' => 'books_tags', 'foreignKey' => 'book_id', 'associationForeignKey' => 'tag_id', 'unique' => true ) ); and viceversa, but the Unique flag does not help me; I can still save two times the same couple. How do I do this in CakePHP? Should I declare the couple (book, tag

问题 Is HABTM supported by Ransack? Having the models: Shop HABTM Categories Category HABTM Shops Can I use ransack to search a Shop by a single category? What does the form look like? 回答1: I think the field you're trying to use would be :categories_id_eq Usage would be something like this <%= f.label :categories_id_eq, "Category" %> <%= f.collection_select :categories_id_eq, Category.order(:title), :id, :title %> 回答2: You should be aware that there are gotchas: while this workds fine :categories

问题 I'm have this two classes, class User include DataMapper::Resource property :id, Serial property :name, String has n :posts, :through => Resource end class Post include DataMapper::Resource property :id, Serial property :title, String property :body, Text has n :users, :through => Resource end So once I have a new post like: Post.new(:title => "Hello World", :body = "Hi there").save I'm having serious problems to add and remove from the association, like: User.first.posts << Post.first #why

问题 What is the method to save and update Many to Many relationship in Yii framework? 回答1: There is a better implementation as behavior. http://www.yiiframework.com/forum/index.php?/topic/6905-please-test-my-ar-enhancement-automatically-sync-many-many-table-when-calling-save/ 回答2: Unless you create a model for the table between the two main tables, your only option is to use DAO (Database Access Object) and specify SQLs with it. Have a look at how blog demo accomplishes this task. 回答3: use MANY

问题 I'm working on a Rails 3.1 app that has the following models: User: class User < ActiveRecord::Base has_and_belongs_to_many :groups has_many :ownerships, :class_name => 'Group' end Group: class Group < ActiveRecord::Base has_and_belongs_to_many :users has_one :owner, :class_name => 'User' end There's a join table between them, and the groups table also has a "user_id" column. I would expect to be able to write this in my groups_controller.rb @group = Group.find(params[:id]) foo = @group.owner