RSpec phương pháp xác định "errors_on"

Question

Tôi có theo mô hình mà tôi muốn thử nghiệm với RSpec:

class Language < ActiveRecord::Base 
    has_and_belongs_to_many :dvds 
    validates :title, presence: true, uniqueness: { case_sensitive: false } 
end 

language_spec.rb

describe Language do 
    describe 'title validation' do 
    context 'title is present' do 
     before(:each) do 
     @lang = Language.new(title: 'English') 
     end 

     it 'is valid with present title' do 
     expect(@lang).to have_exactly(0).errors_on(:title) 
     end 
    end 

    context 'title is not present' do 
     before(:each) do 
     @lang = Language.create 
     end 

     it 'has an error on title attribute' do 
     expect(@lang).to have_exactly(1).errors_on(:title) 
     end 

    end 
    end 
end 

Đáng tiếc là tôi nhận được thất bại thử nghiệm:

Failures:

1) Language title validation title is present is valid with present title Failure/Error: expect(@lang).to have_exactly(0).errors_on(:title) NoMethodError: undefined method errors_on' for #<Language:0xaa40e98> # ./spec/models/language_spec.rb:9:in block (4 levels) in '

2) Language title validation title is not present has an error on title attribute Failure/Error: expect(@lang).to have_exactly(1).errors_on(:title) NoMethodError: undefined method errors_on' for #<Language id: nil, title: nil, created_at: nil, updated_at: nil> # ./spec/models/language_spec.rb:19:in block (4 levels) in '

Gemfile

source 'https://rubygems.org' 

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails' 
gem 'rails', '4.1.1' 
# Use sqlite3 as the database for Active Record 
gem 'sqlite3' 
# Use SCSS for stylesheets 
gem 'sass-rails', '~> 4.0.3' 
# Use Uglifier as compressor for JavaScript assets 
gem 'uglifier', '>= 1.3.0' 
# Use CoffeeScript for .js.coffee assets and views 
gem 'coffee-rails', '~> 4.0.0' 
# See https://github.com/sstephenson/execjs#readme for more supported runtimes 
# gem 'therubyracer', platforms: :ruby 

# Use jquery as the JavaScript library 
gem 'jquery-rails' 
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks 
gem 'turbolinks' 
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder 
gem 'jbuilder', '~> 2.0' 
# bundle exec rake doc:rails generates the API under doc/api. 
gem 'sdoc', '~> 0.4.0',   group: :doc 

# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring 
gem 'spring',  group: :development 

# Pagination plugin 
gem 'will_paginate', '~> 3.0' 

# Testing 
group :development, :test do 
    gem "rspec-rails", "~> 3.0.1" 
    gem "factory_girl_rails", "~> 4.4.1" 
end 

group :test do 
    gem "faker", "~> 1.3.0" 
    gem "capybara", "~> 2.3.0" 
    gem "database_cleaner", "~> 1.3.0" 
    gem "launchy", "~> 2.4.2" 
    gem "selenium-webdriver", "~> 2.42.0" 
end 

Bất kỳ ý tưởng nào tại sao tôi nhận được undefined method "errors_on"?

Answer 1

Cố gắng thiết lập loại tùy chọn:

describe Language, type: :model do 

Hoặc sử dụng infer_spec_type_from_file_location! (Xem here)

RSpec.configure do |config| 
    config.infer_spec_type_from_file_location! 
end 

Answer 2

Các errors_on khớp chuyển đến the rspec-collection_matchers gem, vì vậy nói thêm rằng để Gemfile của bạn sẽ khắc phục lỗi.

Nếu bạn muốn di chuyển ra khỏi cú pháp không cốt lõi, bạn có thể làm

describe Language do 
    describe 'title validation' do 
    context 'title is present' do 
     before(:each) do 
     @lang = Language.new(title: 'English') 
     end 

     it 'is valid with present title' do 
     expect(@lang.errors[:title]).to be_empty 
     end 
    end 

    context 'title is not present' do 
     before(:each) do 
     @lang = Language.create 
     end 

     it 'has an error on title attribute' do 
     expect(@lang.errors.added?(:title, :blank)).to be_true 
     end 
    end 

    end 
end 

(have_exactly and related matchers have also moved to rspec-collection_matchers.)