Summary: Using the following YML I get a reference to a FOREIGN KEY (role_id) that is not in my YML. Problem: I'm trying to create a system where there is a user (CreditName) who can belong to many role's (all of which can have many users). There are also many projects, which can contain many User+Roles, so I'd like the Project to ...
Imagine you live in very simplified example land - and imagine that you've got a table of people in your MySQL database: create table person ( person_id int, name text ) select * from person; +-------------------------------+ | person_id | name | +-------------------------------+ | 1 | Alice | ...
Hi, In default acegi setting, person and authority have many to many relations. Thus, in addtion to people and authorities, there is a table authotiries-people. To delete a person (a user) I have to delete the related record in authotiries-people first....then come back to delete the record... the problem is: other people are still u...
I am writing a small website to store the papers I have written. The relation papers<-> author is important, but the order of the name of the authors (which one is First Author, which one is second order, and so on) is also important. I am just learning Django so I don't know much. In any case so far I have done: from django.db import ...
I'm using the admin interface to view invoices and products. To make things easy, I've set the products as inline to invoices, so I will see the related products in the invoice's form. As you can see I'm using a many-to-many relationship. In models.py: class Product(models.Model): name = models.TextField() price = models.Deci...
I've got two django models (simplified): class Product(models.Model): name = models.TextField() price = models.IntegerField() class Invoice(models.Model): company = models.TextField() customer = models.TextField() products = models.ManyToManyField(Product) I would like to see the relevant products as a nice tabl...
Hi, I have the following data model and i want to break the many-to-many relationship between EntityA and EntityB. I'm doing this by removing EntityC object that connects both of them. I found that EntityA still have a relationship with EntityB although I saved the managed object context, I can see the changes take affect after EntityA r...
Say I have this entity with a lot of attributes. In the input form I have decided to implement a wizard control so I can collect information about this entity in several steps. The problem is that I need to collect information that has been modeled has many to many relationships. I am planning to use a telerik gridview to manage this (...
When saving my many-to-many related entities, the entities are saved ok. However the junction table stays empty: Mapping on Product side (ProductMap.cs) HasManyToMany(x => x.Pictures) .Table("Product_Picture") .ParentKeyColumn("Product") .ChildKeyColumn("Picture") .Cascade.All() .Inverse() This produces the following xml: <bag cas...
Hello, I am having an issue trying to save into an intermediate table. I am new on Rails and I have spent a couple of hours on this but can't make it work, maybe I am doing wrong the whole thing. Any help will be appreciated. =) The app is a simple book store, where a logged-in user picks books and then create an order. This error is ...
Is this the easiest way to insert a record with Linq to Sql when there's a many-to-many relationship, or is there a better/cleaner way? I wasn't sure why things weren't working at first, but when I added a second SubmitChanges() it worked. Why was this necessary? Would be grateful if someone could clarify this a bit! private void Insert...
Hi. I have a model of a club where I want to model the two entities Meeting and Member. There are actually two many-to-many relationships between these entities though, as for any meeting a Member can either be a Speaker or a Guest. Now I am an OO thinker, so would normally just create the two classes and each one would just have two a...
Say I have the following tables and columns: comp: id, model dvd: id, model comp2dvd: id, id_comp, id_dvd A computer can have multiple dvd drives, even of the same model, and a dvd drive can appear in multiple computers. How do I make it so that comp2dvd table can have only existing comp and dvd id...
Hello! In my project, I have users and quests. One User can join multiple quests and one quest can have multiple users. So I created a table called questing, containing the user_id and the quest_id. In my user.rb I did following: require 'digest/sha1' class User < ActiveRecord::Base has_many :questings has_many :quests ,:through =>...
I'm trying to understand the Entity Framework, and I have a table "Users" and a table "Pages". These are related in a many-to-many relationship with a junction table "UserPages". First of all I'd like to know if I'm designing this relationship correctly using many-to-many: One user can visit multiple pages, and each page can be visited b...
I have three tables in my database: An A table, a B table, and a many-to-many ABMapping table. For simplicity, A and B are keyed with identity columns; ABMapping has just two columns: AId and BId. I built an Entity Framework 4 model from this, and it did correctly identify the N:M mapping between A and B. I then built a WCF Data Service...
I have a table called transactions with a many-to-many relationship to items through the items_transactions table. I want to do something like this: SELECT "transactions".* FROM "transactions" INNER JOIN "items_transactions" ON "items_transactions".transaction_id = "transactions".id INNER JOIN "items" ON "items"....
Consider three django models: AA, BB and CC. AA has an M2M reference to BB and BB has an M2M reference to CC. I have a single instance of AA. How do I execute a filter() QuerySet over the set of CC instances that are M2M related the the BB instances that are M2M related to that single AA instance? ...
I'm looking for a very simple ORM framework working on Android for sqlite. I've been testing activeAndroid but none of the example could ever build on Eclipse. By the way, how do guys implements a "many to many" relationship in sqlite for android ? How do you reflect the cascade regarding deletion of rows and guarantee the database integ...
Hi, I have two database tables that have a many to many relationship: People and Organization. And of course there is a table that connects these two called OrganizationPeople. In NHibernate mapping, they each have a Bag of the other. In People's mapping, the Bag is mapped like this: <bag name="Organizations" table="OrganizationPeop...