创建外键关联的记录时在轨创建另一个记录

问题描述：

模式

class User < ApplicationRecord 
    has_many :contracts 
    has_many :properties, through: :contracts 
    has_many :documents, through: :contracts 

class Contract < ApplicationRecord 
    belongs_to :seller_id, :class_name => 'Property' 
    belongs_to :buyer_id, :class_name => 'User' 
    has_many :documents 
    has_one :property 

class Property < ApplicationRecord 
    has_many :contracts 
    has_many :users 

class Document < ApplicationRecord 
    belongs_to :contract 
    has_many :users, through: :contracts 
    has_one :property, through: :contracts

谁创建属性的用户在创建时保存在seller_id下。这是我到目前为止有：

控制器

class DocumentsController < ApplicationController 
    def create 
     @contract = Contract.new() 
     @document = current_user.documents.build(document_params) 
     if @document.save 
     flash[:notice] = "Successfully created document!" 
     redirect_to documents_path 
     else 
     flash[:alert] = "Error creating document!" 
     render :new 
     end 
    end 

class ContractsController < ApplicationController 
    def create 
    @contract = Contract.new(contract_params) 
    if @contract.save 
     @contract.buyer_id << current_user 
     @contract.seller_id << Property.find(params[:seller_id]) 
     @contract.property_id << Property.find(params[:id]) 
     flash[:notice] = "Successfully created contract!" 
    else 
     flash[:alert] = "Error creating contract!" 
    end 
    end 

class PropertiesController < ApplicationController 
    def create 
    @property = current_user.properties.build(property_params) 
    @property.user_id = current_user.id 
    @property.seller_id = current_user.id 
    if @property.save 
     flash[:success] = "Successfully created property!" 
     redirect_to property_path(@property) 
    else 
     flash[:alert] = "Error creating new property!" 
     render :new 
    end 
    end

我的问题

怎么会自动创建该buyer_id的seller_id关联到当前用户，给卖家一个合同备案当我在表单中创建新文档时，该属性和property_id属性？

请彻底，我很新。

谢谢

答

class Contract < ApplicationRecord 
    belongs_to :buyer, :class_name => 'User', foreign_key: buyer_id 
    has_many :documents 
    belongs_to :property, foreign_key: seller_id #belongs_to is used to define the relationship if foreign_key to the associated model is present. 

#Creating Contract 
con = Contract.new(contract_params) 
con.buyers << User.find(current_user.id) # links user to contract via. buyer_id 
con.property << Property.find(params[:property_id]) # links property to contract via seller_id 
con.save! 

#Creating Document 
doc = Document.new(document_params) 
doc.contracts << con # links contract to document 
doc.save!

创建外键关联的记录时在轨创建另一个记录

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