many-to-many

I have 3 tables - User (Id, Name) Roles (Id, Name) UserRoles (UserId, RoleId) I think they are self explanatory. How do I update an entry (UserId and RoleId) in UserRoles? context.User.Roles gives me the list of roles but how do I update them? Thank you. From your comment: context.User.Roles gives me the list of roles. I can do a for-each and update the Id, but how do I update the corresponding UserId foreach RoleId in that table? First of all, you should NOT update the Id's. Secondly, since you are using EF, you should try to think in terms of objects (or entities), rather than "DB-many-to

I'm trying to update a Customer in my database using ASP.NET Web API and Entity Framework 5 code-first, but it's not working. My entities look like this: public class CustomerModel { public int Id { get; set; } public string Name { get; set; } // More fields public ICollection<CustomerTypeModel> CustomerTypes { get; set; } } public class CustomerTypeModel { public int Id { get; set; } public string Type { get; set; } [JsonIgnore] public ICollection<CustomerModel> Customers { get; set; } } Nothing all that special. I've built a web interface where users can add a customer by supplying the name

I'm seeing all sorts of different ways to handle many to many relationships in Yii. However, the examples I'm seeing aren't fully fleshed out and I feel like I'm missing something. For instance, Larry Ullman's tutorial doesn't use the self::MANY_MANY relation - http://www.larryullman.com/2010/08/10/handling-related-models-in-yii-forms/ So as far as adding and retrieving records, whats the standard way for handling Many to Many in the Model, Controller and View? clarification: I suppose Im looking for an example involving 2 tables, related by many-to-many, where I can see not only both models,

I have a SQL table like so: Update: I'm changing the example table as the existing hierarchical nature of the original data (State, Cities, Schools) is overshadowing the fact that a simple relationship is needed between the items. entities id name 1 Apple 2 Orange 3 Banana 4 Carrot 5 Mushroom I want to define two-way relationships between these entities so a user viewing one entity can see a list of all related entities. The relationships are defined by an end user. What is the best way to represent these relationships in the database and subsequently query and update them? One way as I see it

I have a question which I think should be pretty common but I can't find an answer. I have 2 objects: Group and User. My classes look something like this: class Group { @ManyToMany(fetch = FetchType.EAGER) List<User> users; } class User { @ManyToMany(fetch = FetchType.EAGER) List<Group> groups; } Now, when I try to get a User from the database it brings all its groups and all groups bring all its users and so on. Finally, I'm getting a stackoverflow exception. How can I solve this issue and still have my bidirectional association and the ability to reach the objects in the lists? Do you get

I have started working with Laravel4 recently. I am facing some problem while updating pivot table data, in case of many to many relation. The situation is: I have two table: Product , ProductType . The relation between them is Many to many . My Models are class Product extends Eloquent { protected $table = 'products'; protected $primaryKey = 'prd_id'; public function tags() { return $this->belongsToMany('Tag', 'prd_tags', 'prta_prd_id', 'prta_tag_id'); } } class Tag extends Eloquent { protected $table = 'tags'; protected $primaryKey = 'tag_id'; public function products() { return $this-

In Symfony 1 there was as form widget named admin_double_list. It generated two select fields named Unassociated and Associated. It also generated buttons to add items from one list to another. Is there any easy way to accomplish this in Symfony2? Or maybe some other user friendly way to edit many-to-many relations? In the documentation there are only four widgets for many-to-many relations and none of them are very nice when there are massive amount of relation possibilities to edit. You can easily manage many-to-many relationships with entity form field . For example If User as a many-to