associations

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CakePHP: hasMany model association not recursively fetching

I have the following association: Site - hasMany - Sitekey Sitekey - belongsTo - Site sites.id is primary key[详细]

2023-04-03 04:31 分类：问答
Dataset for Apriori algorithm

I am going to develop an app for Market Basket Analysis (using apriori algorithm) and I found a dataset which has more than 90,000 Transaction records .[详细]

2023-04-02 05:31 分类：问答
How to save associated model objects on the creation time of the parent model?

I am using Ruby on Rails 3.0.7 and I would like to save associated model class instances (I use an has_many :through => ... association) on the creation time of the parent model. That is, I have th[详细]

2023-04-02 01:15 分类：问答
NHibernate uni-directional associations

Playing around with Fluent NHibernate\'s Getting Started project. I tried to customize the example a bit, for a few reasons, among them elimination of circular reference for json serialization.[详细]

2023-04-01 21:24 分类：问答
Trouble on saving nested models

I am using Ruby on Rails 3.0.7 and I am trying to save an \"has_many :through => checkboxes\" class object (I have read the Quick Tip: has_many :through => checkboxes blog post) but I have some tro[详细]

2023-04-01 10:22 分类：问答
How can I stop collection<<(object, …) from adding duplicates?

Given a Dinner model that has many Vegetable models, I would prefer that dinner.vegetables << carrot[详细]

2023-04-01 01:08 分类：问答
Mongoid associations, lazy loading, and all

I have the following model class Vote include Mongoid::Document include Mongoid::Timestamps field :value, :type => Symbol # can be :aye, :nay, :abstain, :present[详细]

2023-03-31 17:50 分类：问答
Difference between update_attributes and setting to nil directly

Is there a difference between the following two snippets for this given class? class MyObjectClass < ActiveRecord::Base[详细]

2023-03-31 09:57 分类：问答
Join table attribute updates in Many-to-Many Relation

I have a many-to-many relation setup for a data model which deals with a problem domain of Members and Addresses.Basically a \'member\' can have multiple \'addresses\', think of like when you have a w[详细]

2023-03-30 20:20 分类：问答
has_many :through -- Adding metadata to the through relationship

I have a need to add metadata about a HABTM relationship. I wanted to use a has_many :through relationship to accomplish this, but it is not necessary. Here is the problem simplified:[详细]

2023-03-29 20:44 分类：问答