通过两种不同的方式访问has_many关系ActiveRecord Rails [英] access has_many relation in two different ways ActiveRecord Rails

问题描述

我需要以两种方式进入机构. 我的模型如下:

I need to access institution in two ways. My models are given below:

class Person < ActiveRecord::Base
  has_many :institution_people
  has_many :institution_choices
  has_many :institutions, :through => :institution_people
  has_many :institutions, :through => :institution_choices
  fields........
end

class Institution < ActiveRecord::Base
  has_many :people, :through => :institution_people
  has_many :people, :through => :institution_choices
  has_many :institution_people
  has_many :institution_choices
end

class InstitutionChoice < ActiveRecord::Base
  belongs_to :person
  belongs_to :institution
end

class InstitutionPerson < ActiveRecord::Base
  belongs_to :person
  belongs_to :institution
end

我设置像这样的模型是因为人们可以在不同的机构学习，所以为此我设置

The i setup the models like this is that person can study in different institutions, so for this i setup

has_many :institutions, :through => :institution_people

用于人物模型

但是同时人们可以选择机构，所以我设置了

But at the same time person can have institution choices, so i setup

has_many :institutions, :through => :institution_choices

用于人员模型.

我应该如何设置人与机构之间的模型和关联，以便可以从两种方式从人中找到机构.

How should i setup model and association between person and institutions so that i can find institutions from person in both ways.

现在

Person.first.institutions 

从stitutional_people表中查找，就像

finds from institution_people table, as

has_many :institutions, :through => :institution_people

我猜是刚开始.

欢迎使用其他一些技术，这样我就可以通过两种方式建立机构.

Some other techniques are welcomed so that i can get institutions in both ways.

推荐答案

在您的Person模型中，尝试以下操作:

In your Person model, try this :

class Person < ActiveRecord::Base
  has_many :institution_people
  has_many :institution_choices
  has_many :institutions_people, :through => :institution_people, :source => :institutions, :class_name => "Institution"
  has_many :institutions_choices, :through => :institution_choices, :source => :institutions, :class_name => "Institution"
end

http://guides.rubyonrails.org/association_basics.html#has_many-关联参考

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