將另一個模型添加到另一個導軌

Question

我試圖想出一種讓客戶將自己添加到類別的方法。含義 - 我希望能夠在我的views @ customer.add_to_category（category）或類似的地方打電話。有什麼建議麼？

class Category < ActiveRecord::Base 
#Associations 


has_many :customers 

#Defs 
def add_customer(customer_id) 
    current_customer = Customer.find_by(customer_id: customer_id) 
    if current_customer 
     current_customer = Customer.build(customer_id: customer_id) 
    end 
    current_customer 
end 
end 

Answer 1

在您當前的架構中，每個類別只能屬於一個用戶。這將是最好能有像這樣：

Customer 
    has_many :customer_categories 
    has_many :categories, :through => :customer_categories 

Category 
    has_many :customer_categories 
    has_many :customers, :through => :customer_categories 

CustomerCategory 
    belongs_to :customer 
    belongs_to :category 

那麼你的類別＃add_customer方法應該只是

def add_customer(customer_id) 
    if customer = Customer.where(id: customer_id).first 
    self.customers << customer unless self.customers.include?(customer) 
    end 
end 

你可以做的這反過來在客戶類，效果顯着。