在FactoryGirl中设置父级的子属性

Question

如何设置依赖于FactoryGirl的依赖属性？

FactoryGirl.define do 
    factory :line_item do 
    quantity 1 
    price 30 # I want price to come from the product association: self.product.price 

    cart 
    order 
    product 
    end 
end 

我试过，但没有奏效：

factory :line_item do |f| 
    f.quantity 1 

    f.cart 
    f.order 
    f.product 
    after_build do |line_item| 
     line_item.price = line_item.product.price 
    end 
    end 

Answer 1

尝试是这样的：

FactoryGirl.define do 
    factory :line_item do 
    quantity 1 
    price { product.price } 

    cart 
    order 
    product 
    end 
end