Ruby-on-rails 工厂女孩在构建/创建时将参数传递给模型定义
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原文地址: http://stackoverflow.com/questions/17967947/
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factory girl passing arguments to model definition on build/create
提问by Furqan Asghar
models/message.rb
模型/消息.rb
class Message
attr_reader :bundle_id, :order_id, :order_number, :event
def initialize(message)
hash = message
@bundle_id = hash[:payload][:bundle_id]
@order_id = hash[:payload][:order_id]
@order_number = hash[:payload][:order_number]
@event = hash[:concern]
end
end
spec/models/message_spec.rb
规格/模型/message_spec.rb
require 'spec_helper'
describe Message do
it 'should save the payload' do
payload = {:payload=>{:order_id=>138251, :order_number=>"AW116554416"}, :concern=>"order_create"}
message = FactoryGirl.build(:message, {:payload=>{:order_id=>138251, :order_number=>"AW116554416"}, :concern=>"order_create"})
message.event.should == "order_create"
end
end
error_log
错误日志
Failures:
失败：
1) Message should save the payload
1) 消息应保存有效载荷
Failure/Error: message = FactoryGirl.build(:message, {:payload=>{:order_id=>138251, :order_number=>"AW116554416"}, :concern=>"order_create"})
ArgumentError:
wrong number of arguments (0 for 1)
# ./app/models/message.rb:4:in `initialize'
# ./spec/models/message_spec.rb:7:in `block (2 levels) in <top (required)>'
回答by cryo28
FactoryGirl requires you to define factory first. Let's say in a file spec/factories/messages.rb:
FactoryGirl 要求您首先定义工厂。让我们在文件 spec/factories/messages.rb 中说：
FactoryGirl.define do
factory :message do
bundle_id 1
order_id 2
...etc...
end
end
After this you'll be able to invoke factory build create like this:
在此之后，您将能够像这样调用 factory build create：
FactoryGirl.build(:message) # => bundle_id == 1, order_id == 2
FactoryGirl.build(:message, order_id: 3) # => bundle_id == 1, order_id == 3
However, there is one problem in your particular case. FactoryGirl's default builders operate on top of ActiveRecord-alike interface. It sets defined attributes through setters, not through a hash of attrs passed to the model constructor:
但是，在您的特定情况下存在一个问题。FactoryGirl 的默认构建器在类似 ActiveRecord 的界面上运行。它通过 setter 设置定义的属性，而不是通过传递给模型构造函数的属性哈希：
m = Message.new
m.bundle_id = 1
m.order_id = 2
So you have to create a custom constructor to work with the interface of your model (which doesn't conform to ActiveRecord-alike model) and register it in your factory definition. See factory girl docsfor details.
因此，您必须创建一个自定义构造函数来处理模型的接口（不符合 ActiveRecord 类似模型）并将其注册到您的工厂定义中。有关详细信息，请参阅工厂女孩文档。
Let me show you an example of doing so. Sorry I didn't test it but it should give you a clue:
让我向你展示一个这样做的例子。对不起，我没有测试它，但它应该给你一个线索：
FactoryGirl.define do
factory :message do
ignore do
# need to make all attributes transient to avoid FactoryGirl calling setters after object initialization
bundle_id 1
order_id 2
end
initialize_with do
new(payload: attributes)
end
end
end
回答by Mikey Hogarth
It's because you have a constructor with mandatory arguments. You have a few options;
这是因为您有一个带有强制参数的构造函数。你有几个选择；
1) Make the argument non-mandatory (although this would mean you're changing your code to suit your tests - naughty!)
1）使参数成为非强制性的（尽管这意味着您正在更改代码以适合您的测试 - 顽皮！）
def initialize(message = nil)
2) Use the "initialize_with" syntax in your factory;
2）在你的工厂中使用“initialize_with”语法；
describe Message do
it 'should save the payload' do
payload = {:payload=>{:order_id=>138251, :order_number=>"AW116554416"}, :concern=>"order_create"}
message = FactoryGirl.build(:message, {:payload=>{:order_id=>138251, :order_number=>"AW116554416"}, :concern=>"order_create"})
message.event.should == "order_create"
end
initialize_with { new(message) }
end
