relationships

问题 I am dealing with the following situation: I have two models, an Employee with id and name fields and a Telephone with id , employee_id and flag fields. There is also an one-to-many relationship between these two models, that is an employee may have many telephones and a telephone may belong to a single employee. class Employee extends Model { public function telephones() { return $this->hasMany(Telephone::class); } } class Telephone extends Model { public function employee() { return $this-

问题 I have the next code for two classes: public class Object { public int ObjectID { get; set; } public int Object2ID { get; set; } public virtual Object2 Object2 { get; set; } } public class Object2 { public int Object2ID { get; set; } public virtual ICollection<Object> Objects { get; set; } } I know that with Entity Framework, this will create a one-to-many relationship, but what I want to know, is how to transform this to a zero-to-many relationship. I'm new to Entity Framework and I couldn't

问题 I'm having a slight problem that I can't figure out, but should be really simple. I have the following model structure in my cakePHP (1.3) app: ProspectiveQuote [hasMany] QuoteUnit [belongsTo] Unit but in my ProspectiveQuotesController the line: $this->ProspectiveQuote->QuoteUnit->Unit->find('list'); gives me the following error: Undefined property: AppModel::$Unit Of course, it shouldn't be looking at AppModel, it should be looking at QuoteUnit. If I do $this->ProspectiveQuote->QuoteUnit-

问题 In my site (api using laravel 5.6 and laravel passport) I have two types of users (Teachers and Students), in the future there will be more. The teacher and student entities are very different, meaning that if I keep them all in one table, the table will be long and many fields will have a null value. Right now I have one Users table with common fields and two other tables (Teachers and Students) to which I have setup a polymorphic relationship from user. My question is if this is a good

问题 So i've this problem i've 2 tables for example templates(id,user_id,template_name,reference) user_settings(id,user_id,default_template) so each user can create many templates and in his settings he can choose a default template that he will always use so now there is many users so when a user want to choose a default template, he can see all templates (his own templates and the templates for the other users) tables are so defined: db.define_table('i2l_templates', Field('id','id', represent

问题 I have a model, Comment, that belongsto Module, Photo, Review, Article, and User. In turn, each of those models havemany Comment. User belongsto Avatar and Avatar hasmany User In the code below I successfully retrieve the latest 5 comments regardless of what model they come from (Photo, Article, Review) and I display some information about the User (username, online status). $recentComments = $this->find('all', array( 'limit' => '5', 'order' => array('Comment.id' => 'desc'), 'conditions' =>

问题 So I have this model: class Model < ActiveRecord::Base attr_accessible :to_id, :to_type belongs_to :to, polymorphic: true end I was wondering if I could add another relationship when belongs_to is on a specific type: class Model < ActiveRecord::Base attr_accessible :to_id, :to_type belongs_to :to, polymorphic: true belongs_to :to_user, :foreign_key => :to_id, :conditions => ['to_type = ?', 'User'] # doesn't work # OR MAYBE belongs_to :to_user, :foreign_key => :to_id, :foreign_class => 'User'

问题 I'm managing my admin backend with Typus I want to add a field with a checkbox for each category. I used this code: Post: fields: default: name, description, user, categories list: name, description, user, categories form: name, description, user, categories relationships: categories But the result is a textfield with a [] inside: how do I solve this? Is there a native way or must I override the field template? 回答1: To show the the checkbox for the fields you can use the existing template of

问题 I'm managing my admin backend with Typus I want to add a field with a checkbox for each category. I used this code: Post: fields: default: name, description, user, categories list: name, description, user, categories form: name, description, user, categories relationships: categories But the result is a textfield with a [] inside: how do I solve this? Is there a native way or must I override the field template? 回答1: To show the the checkbox for the fields you can use the existing template of

问题 I have three tables: users , ideas , and ideas_likes . The ideas_likes table looks like: ideas_likes ------------ id primary key user_id foreign key idea_id foreign key liked boolean There's already a one-to-many relationship set up between users and ideas. It looks something like this: class User extends Ardent implements UserInterface, RemindableInterface { use UserTrait, RemindableTrait; protected $table = 'users'; public function ideas() { return $this->hasMany('Idea'); } } Similarly, the