many-to-many

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Core data bug refers to nonexistent core data attribute of reflexive many-to-many relationship

I am experiencing a perplexing Core Data bug, in which I receive the following error message when trying to save some data:[详细]

2023-04-07 06:36 分类：问答
Update bidirectional ManyToMany from both sides

referring the question Saving bidirectional ManyToMany i want to obtain exacltly what accepted answer explain as incorrect:[详细]

2023-04-07 03:06 分类：问答
JPA Annotations for many-to-many relation between objects of the same entity

I want to implement a Role Hierarchy but am rather new to JPA Annotations. I have a Role Entity with a name and an id(implicit via AbstractPersistable):[详细]

2023-04-06 11:54 分类：问答
How to ask the Django manytomany manager to match several relations at once?

I\'ve got this model: class Movie(models.Model): # I use taggit for tag management tags = taggit.managers.TaggableManager()[详细]

2023-04-06 08:25 分类：问答
mysql many-to-many query issue

i have many to many database and i\'m there is a query that i just got stuck with and cant do it. i have 4 tables Artists, Tracks, Albums, Clips[详细]

2023-04-05 19:17 分类：问答
CoreData: many-to-many relationship

I have 2 objects, with many to many relationships. Here\'s my code: + (NSSet *)activitiesSetForMember:(Members *)member inManagedObjectContext:(NSManagedObjectContext *)context{[详细]

2023-04-05 17:35 分类：问答
How to get Collection object throug Many to Many relationship in Ruby on Rails

Friends I\'ve following models class Project < ActiveRecord::Base has_many :milestones_projects has_many :milestones, :through => :milestones_projects[详细]

2023-04-05 17:26 分类：问答
Entity Framework Code 1st - Mapping many-to-many with extra info

I\'ve looked through several of the questions here and am not quite connecting all the (mental) dots on this.I would apprec开发者_Go百科iate some help.[详细]

2023-04-05 15:20 分类：问答
User groups management

I am trying to implement user management functionality for a web site. I am using ASP.NET MVC 3, Entity Framework 4.1, MvcScaffolding.[详细]

2023-04-05 13:01 分类：问答
Only one side of join table being saved?

In my app, User objects can follow each other, and be followed. The two relationships are distinct. I\'m seeing that when I set user_a.follows << user_b that user_b.followed_by.count still == 0[详细]

2023-04-05 10:41 分类：问答