如何在Rails中測試belongs_to和has_many？

Question

我正在使用rspec，我試圖測試我的模型y是否有許多x。我已經嘗試了各種各樣的東西，包括遍歷方法數組，並且似乎無法在線找到好方法。那我該用什麼？

Answer 1

沒有太多的黑客可以使用卓越的寶石：http://github.com/carlosbrando/remarkable

從顯着的文檔摘自：

describe Post do 
     it { should belong_to(:user) } 
     it { should have_many(:comments) } 
     it { should have_and_belong_to_many(:tags) } 
    end 

Answer 2

您可以在類反映：

MyModel.reflect_on_association(:x).macro == :has_one 

它可能更容易，如果你只是用早該有輔助方法，所以它讀取更乾淨：it { should have_many(:x) }

Answer 3

這裏是一個RSpec獨立的解決方案，關鍵是使用reflect_on_assocation

class MyModel < ActiveRecord::Base 
    has_many :children 
    belongs_to :owner 
end 

reflection_children = MyModel.reflect_on_association(:children) 

if !reflection_children.nil? 
    if reflection_children.macro == :has_many 
    # everything is alright 
    else 
    # it's not has_many but exists 
    end 
else 
    # it doesn't exist at all ! 
end 

reflection_owner = MyModel.reflect_on_association(:owner) 

if !reflection_owner.nil? 
    if reflection_owner.macro == :belongs_to 
    # everything is alright! 
    else 
    # it's not belongs_to but exists 
    end 
else 
    # it doesn't exist at all! 
end