Rails RSpec Tests for a has_many :through Relationship

user_365858 0
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I'm new to testing and rails but i'm trying to get my TDD process down properly.

I was wondering if you use any sort of paradigm for testing has_many :through relationships? (or just has_many in general i suppose).

For example, i find that in my model specs i'm definitely writing simple tests to check both ends of a relationship for relating methods.

ie:

require 'spec_helper'

describe Post do

  before(:each) do
    @attr = { :subject => "f00 Post Subject", :content => "8ar Post Body Content" }
  end

  describe "validations" do
  ...    
  end

  describe "categorized posts" do

    before(:each) do
      @post  = Post.create!(@attr)
    end

    it "should have a categories method" do
      @post.should respond_to(:categories)
    end

  end

end

Then in my categories spec i do the inverse test and check for @category.posts

What else am i missing? thanks!!

rspec has-many has-many-through ruby-on-rails ruby
4 Answers

For the sake of completeness, in 2020 this is possible without additional gems. 

  it "has many categories" do
    should respond_to(:categories)
  end

And even more explicit:

it "belongs to category" do
  t = Post.reflect_on_association(:category)
  expect(t.macro).to eq(:belongs_to)
end

(see Ruby API on Reflection)

The second example makes sure that a "has_one" is not confused with a "belongs_to" and vice versa

It is, however, not limited to has_many :through relationships, but can be used for any association applied to the model.

(Note: This is using the new rspec 2.11 syntax with Rails 5.2.4)

user_72652880
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