many-to-many

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Naming Generated Functions in Propel

The ideo of cross-reference tables is introduced in Propel 1.5. This means that an entity can get a list of related items as if it were a one-to-many relation. So in a person-to-groups relationship, a[详细]

2023-03-29 04:21 分类：问答
Looping over related (M2M) items in the order specified by the intermediatry relationship

Using the example from the docs: https://docs.djangoproject.com/en/1.2/topics/db/models/#intermediary-manytomany[详细]

2023-03-29 01:30 分类：问答
How do I create an inline editable many-to-many relationship

the situation In my example I want to create a Page model with a many to many relationship with a content-blocks model.[详细]

2023-03-29 00:35 分类：问答
Implementing ManyToMany association in Ext Js 4

I\'ve looked around everywhere on the web but I can\'t seem to find a way to implement many to many association in Est Js 4 models. Take the prototypical example.开发者_如何学编程 I have an applicatio[详细]

2023-03-28 23:12 分类：问答
Django, sum of fields in intermediary model with given queryset

I have 2 models, one of them has many to many relation with itself through other table like this. class a(models.Model):[详细]

2023-03-28 19:51 分类：问答
Django many-to-many relationship with extra fields

I am building a simple interface to a biological database using the django-admin to populate the db. I want tot to use a many-to-many relationship for a questionnaire to fish species (one questionnair[详细]

2023-03-28 15:20 分类：问答
JPA : Many to many relationship in Google App

I\'m beginner of Google app. I want to know how to code many to many relationship for JPA in Google app. Could u giv开发者_运维百科e me the example? I\'m trying to connect Order, Order_Item and Produc[详细]

2023-03-28 14:37 分类：问答
db design: efficiency consideration when adding an intermediate class into a Many-Many relationship

I understand an intermediate class is often introduced to capture information in a situation where for example, a team has many players, and a player plays for many teams over the years.The interme开发[详细]

2023-03-28 08:27 分类：问答
Does it make sense to use a varchar column as foreignkey reference?

Given two tables books and authors where each of them already have a unique key which is of varchar type which identifys them throughout my ecosystem. Does it make sense to use those keys as Foreignke[详细]

2023-03-27 22:43 分类：问答
has_many through build

I have two models. User and Account as follows class Account < ActiveRecord::Base has_many :manages has_many :users, :through => :manages[详细]

2023-03-27 20:22 分类：问答