has-many

问题 I have the following tables: user (id, cv_personal_data_id), cv_personal_data (id, firstname, surname, gender, address, ...), cv_laboral_exp (id, user_id, position, seniority,... ), cv_study (id, user_id, name, institution, average, ...), cv_language (id, user_id, language_name, writing_level, ...) In my User model I have defined the following relations: public function relations() { return array( 'cvLaboralExps' => array(self::HAS_MANY, 'CvLaboralExp', 'user_id'), 'cvLanguages' => array(self

问题 I am converting a working app from cakephp2 to cakephp3. I'm struggling to get a form that updates hasMany records to work. The app has the following structure: MODELS: use Cake\ORM\Table; use Cake\Validation\Validator; class AwardsTable extends Table { public function initialize(array $config) { $this->hasMany('Levels', ['sort' => 'sort_order']); } } namespace App\Model\Entity; use Cake\Auth\DefaultPasswordHasher; use Cake\ORM\Entity; class Award extends Entity { protected $_accessible = [

问题 I'm not sure what has changed getting this error when trying to login: ERROR: relation "tags" does not exist LINE 1: SELECT DISTINCT "tags".* FROM "tags" INNER JOIN "taggings" O... The tag model: class Tag < ActiveRecord::Base attr_accessor :unread_count, :user_feeds has_many :taggings has_many :feeds, through: :taggings end The tagging model: class Tagging < ActiveRecord::Base belongs_to :tag belongs_to :feed belongs_to :user end And the user relationships: class User < ActiveRecord::Base

问题 I'm building a football game and I'm having trouble creating Club and Match classes. I want to be able to do this: match = Match.find(2) match.home_club = <some club here> match.away_club = <other club here> And also this: club = Club.find(2) club.matches # Returns all matches where club plays home or away This is what I have now: class Club < ActiveRecord::Base has_many :matches end class Match < ActiveRecord::Base belongs_to :home_club, :class_name => "Club" belongs_to :away_club, :class

问题 Suppose the following data schema: Usage ====== client_id resource type amount Billing ====== client_id usage_resource usage_type rate In this example, suppose I have multiple resources, each of which can be used in many ways. For example, one resource is a widget . Widgets can be foo ed and they can be bar ed. Gizmo s can also be foo ed and bar ed. These usage types are billed at different rates, possibly even different rates for different clients. Each occurence of a usage (of a resource)

问题 I have two models: (Albums and Product) 1) Inside Models Inside album.rb: class Album < ActiveRecord::Base attr_accessible :name has_many :products end Inside product.rb: class Product < ActiveRecord::Base attr_accessible :img, :name, :price, :quantity belongs_to :album end 2) Using " rails console ", how can I set the associations (so I can use "<%= Product.first.album.name %>")? e.g. a = Album.create( :name => "My Album" ) p = Product.create( :name => "Shampoo X" ) # what's next? how can i

问题 I am new to Backbone-relational, I am not sure what is the right way to use HasMany. I have a Parent model which have many children (by "many" I mean thousands of children). In order to avoid performance issue, I query children by their foreign key: /child/?parent=1 , instead of create a huge list of child_ids in Parent . But seems this is not the way Backbone-relational work. So I am wondering what is the right way to handle this. 1, Change my json api to include list of child id in parent,

问题 I try to create a polymorphic association, what is common in Rails but unfortunately not in Yii2. As part of the implementation I need to define the relation: public function getImages() { return $this->hasMany(RecipeImage::className(), ['imageable_id' => 'id', 'imageable_type' => 'Person']); } But this doesn't work, because 'Person' is treated as an attribute of the current model, but it is a constant (class name for the polymorphic association). If I try to use 'andWhere' it adds the

问题 What would be the best way to model the following situation: Word belongs_to :wordable, :polymorphic => true Phrase has_many :words, :as => :workable belongs_to :story Line has_many :words, :as => :wordable belongs_to :story Story has_many :lines has_many :phrases has_many :words, :through => :phrases has_many :words, :through => :lines I want to be able to do @story.words to get list of all words that are linked to a story either via lines or via phrases... Is that possible? 回答1: Try this:

问题 I have a: has_and_belongs_to_many :friends, :join_table => "friends_peoples". To add a friend I do: @people.followers << @friend which create the relationship and a new person profile. Now I'd like to delete the relationship ONLY and not the person profile. I tried @people.friends.delete(guilty.id) but it deletes the person profile and not the relationship. Any idea? 回答1: Have you tried this? @people.friends.delete(guilty) 来源： https://stackoverflow.com/questions/3852017/delete-a-has-many