Rails多態連接表工作雙向

我開始學習更高級的關聯，並且多態連接表看起來很有趣，但是我遇到了一個不好的限制。Rails多態連接表工作雙向

我的模型：

school_class.rb：

class SchoolClass < ActiveRecord::Base 
    has_many :class_of_schools, as: :school_model, dependent: :destroy 
    has_many :basic_primary_schools, through: :class_of_schools 
    has_many :basic_shugenja_schools, through: :class_of_schools 
    has_many :basic_monk_schools, through: :class_of_schools 
end

class_of_school.rb：

class ClassOfSchool < ActiveRecord::Base 
    belongs_to :school_model, polymorphic: true 
    belongs_to :school_class 
end

basic_primary_School.rb：

class BasicPrimarySchool < ActiveRecord::Base 

    has_many :class_of_schools, as: :school_model, dependent: :destroy 
    has_many :school_classes, through: :class_of_schools 
end

shugenja_school和monk_schools，與basic_primary_school具有相同的關聯。

並加入模型，可以自：

class CreateClassOfSchools < ActiveRecord::Migration 
    def change 
    create_table :class_of_schools do |t| 
     t.integer :school_class_id 
     t.integer :school_model_id 
     t.string :school_model_type 

     t.timestamps null: false 
    end 
    end 
end

它加入以及在校一面，我可以讓school.class_schools，我也得到相關school_classes的陣列。但在另一方面，我不能這樣做。事實上，當我檢查school_class.classes_of學校時，我得到空陣列。我讓我的種子文件關聯按功能如下：

def join_schools_with_classes(school_object_name, school_classes_array) 
    school_object_name.all.each do |school| 
    school_classes = school_classes_array[school.name] 
    school_classes.each do |class_name| 
     school_class = SchoolClass.find_by(name: class_name) 
     school.class_of_schools.create(school_class_id: school_class.id) 
    end 
    end 
end

我的問題：

我怎樣才能讓這個關聯是雙向的？所以我可以撥打ClassSchool.first.class_of_schools返回，所有與此對象關聯的對象。仍然可以撥打BasicPrimarySchool.first.school_classes獲取關聯的school_class對象。

來源

2016-04-03 Kazik

只是刪除as: :school_model在SchoolClass關係

has_many :class_of_schools, dependent: :destroy

編輯

變化SchoolClass到

has_many :basic_primary_schools, through: :class_of_schools, source: :school_model, source_type: "BasicPrimarySchool"

來源

2016-04-03 10:10:59

它的工作作爲school_class.classes_of_school現在返回數組的關係那些對象:) 但是當我嘗試獲得SchoolClass.first.basic_primary_schools時，我得到'ActiveRecord :: HasManyThroughSourceAssociationNotFoundError：找不到源關聯' – Kazik

檢查編輯以解決該問題 –

正確的答案是'has_many：basic_primary_schools，通過：：class_of_schools，來源：：school_model，source_type：「BasicPrimarySchool」'但我會將答案標記爲正確，請更新它。 – Kazik

Rails多態連接表工作雙向

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