associations

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Selecting only rows which are associatied to a row in some other particular table

table1: columns: id, name table2: columns: id, name assoc_table1_table2: columns: id_table1, id_table2 I need to select all rows from table1 where at least one row in table2 is associated with thi[详细]

2023-03-29 08:09 分类：问答
BLToolkit Association Linq

Here is an example usage of list associations taken from BLToolkit http://bltoolkit.net/(S(ibvuiu3itvirtq550l4r0n55))/Doc.LinqAssociations.ashx[详细]

2023-03-29 07:40 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
undefined method `each' Problem/Question?

<% @company.contacts.each do |contactall| %> <% contactall.each do |contact| %> <%= contact.name %>[详细]

2023-03-28 13:59 分类：问答
Rails: Why "has_many ..., :through => ..." association results in "NameError: uninitialized constant ..."

To express that a group can have multiple users, and a user can belong to multiple groups, I开发者_开发百科 set the following associations:[详细]

2023-03-27 21:43 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
ActiveRecord Validation: association saved even if validation failed

Errors are added to error object of record but associations are still saved. class Parent < ActiveRecord::Base[详细]

2023-03-27 15:45 分类：问答
What is the best way to implement Polymorphic Association in SQL Server?

I have tons of instances where I need to implement some sort of Polymorphic Associa开发者_JAVA百科tion in my database. I always waste tons of time thinking through all the options all over again. Here[详细]

2023-03-27 09:35 分类：问答
Chaining Rails 3 scopes in has_many through association

Is this doable? I have the following scope: class Thing < ActiveRecord::Base scope :with_tag, lambda{ |tag| joins(:tags).where(\'tags.name = ?\', tag.name)[详细]

2023-03-27 04:46 分类：问答
Mixing polymorphic and 'has_many' associations

Two models: Review and User. Review has three relevant fields: user_id, reviewable_type, and reviewable_id. So, the associations look something like this:[详细]

2023-03-27 03:19 分类：问答