Ruby on rails RSpec测试控制器操作创建不影响测试数据库

我有控制器类别，其中包含操作创建：

def create
    @category = Category.new(category_params)
    respond_to do |format|
      if @category.save
        format.html { redirect_to @category, notice: 'Category was successfully created.' }
        format.json { render :show, status: :created, location: @category }
      else
        format.html { render :new }
        format.json { render json: @category.errors, status: :unprocessable_entity }
      end
    end
  end


 def category_params
   params.require(:category).permit(:name, :user_id)
 end

我需要使用RSpec来测试它。 我写了一个测试：

before(:each) do
    @user = create(:user)
    sign_in @user
  end

describe 'POST #create' do
    it 'creates category' do
      expect do
        post :create, params: {
          category: attributes_for(:category, user_id: @user.id)
        }
      end.to change { Category.count }.by(1) and
        redirect_to Category.last && have_http_status(200) and
        render_template('show')
    end
  end

当我跑的时候

$bundle exec rspec

it输出

完成时间为0.55119秒（文件加载时间为7.36秒）2 例如，0次失败

但是当我醒来的时候

钢轨c试验

并尝试输出Cateroy.all或Category。首先，它会显示数据库为空。我还尝试通过pgadmin检查数据库，结果很清楚。

但我不明白，为什么在它成功通过测试后，它会变得清晰。 我不使用gem“数据库清理器” 我还可以提供我最后的测试日志：

Completed 200 OK in 139ms (Views: 44.3ms | ActiveRecord: 4.5ms)
  [1m[35m (0.1ms)[0m  [1m[31mROLLBACK[0m
  [1m[35m (0.1ms)[0m  [1m[35mBEGIN[0m
  [1m[35m (0.1ms)[0m  [1m[35mSAVEPOINT active_record_1[0m
  [1m[36mUser Exists (0.2ms)[0m  [1m[34mSELECT  1 AS one FROM "users" WHERE "users"."email" = $1 LIMIT $2[0m  [["email", "roxane@bartoletti.org"], ["LIMIT", 1]]
  [1m[35mSQL (0.3ms)[0m  [1m[32mINSERT INTO "users" ("email", "encrypted_password", "confirmed_at", "created_at", "updated_at") VALUES ($1, $2, $3, $4, $5) RETURNING "id"[0m  [["email", "roxane@bartoletti.org"], ["encrypted_password", "$2a$04$8uzV2Wd4I7iOHvywVl3CUOK..eSLgSOwjYL31Fo6bu6wR.k4YPDVS"], ["confirmed_at", "2018-01-11 00:00:00"], ["created_at", "2018-01-11 16:35:24.255470"], ["updated_at", "2018-01-11 16:35:24.255470"]]
  [1m[35m (0.1ms)[0m  [1m[35mRELEASE SAVEPOINT active_record_1[0m
  [1m[35m (0.3ms)[0m  [1m[34mSELECT COUNT(*) FROM "categories"[0m
Processing by CategoriesController#create as HTML
  Parameters: {"category"=>{"name"=>"Amani Rogahn", "user_id"=>"4"}}
  [1m[36mUser Load (0.3ms)[0m  [1m[34mSELECT  "users".* FROM "users" WHERE "users"."id" = $1 ORDER BY "users"."id" ASC LIMIT $2[0m  [["id", 4], ["LIMIT", 1]]
  [1m[35m (0.1ms)[0m  [1m[35mSAVEPOINT active_record_1[0m
  [1m[36mCategory Exists (0.3ms)[0m  [1m[34mSELECT  1 AS one FROM "categories" WHERE ("categories"."id" IS NOT NULL) AND "categories"."slug" = $1 LIMIT $2[0m  [["slug", "amani-rogahn"], ["LIMIT", 1]]
  [1m[36mUser Load (0.2ms)[0m  [1m[34mSELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT $2[0m  [["id", 4], ["LIMIT", 1]]
  [1m[35mSQL (0.3ms)[0m  [1m[32mINSERT INTO "categories" ("name", "user_id", "created_at", "updated_at", "slug") VALUES ($1, $2, $3, $4, $5) RETURNING "id"[0m  [["name", "Amani Rogahn"], ["user_id", 4], ["created_at", "2018-01-11 16:35:24.564081"], ["updated_at", "2018-01-11 16:35:24.564081"], ["slug", "amani-rogahn"]]
  [1m[35m (0.1ms)[0m  [1m[35mRELEASE SAVEPOINT active_record_1[0m
Redirected to http://test.host/en/categories/amani-rogahn
Completed 302 Found in 9ms (ActiveRecord: 1.4ms)
  [1m[35m (0.2ms)[0m  [1m[34mSELECT COUNT(*) FROM "categories"[0m
  [1m[36mCategory Load (0.2ms)[0m  [1m[34mSELECT  "categories".* FROM "categories" ORDER BY "categories"."id" DESC LIMIT $1[0m  [["LIMIT", 1]]
  [1m[35m (0.1ms)[0m  [1m[31mROLLBACK[0m

这是我的rails\u helper.rb

require 'support/factory_bot'
require 'spec_helper'
ENV['RAILS_ENV'] ||= 'test'
require File.expand_path('../../config/environment', __FILE__)
abort("The Rails environment is running in production mode!") if Rails.env.production?
require 'rspec/rails'
ActiveRecord::Migration.maintain_test_schema!
RSpec.configure do |config|
  config.fixture_path = "#{::Rails.root}/spec/fixtures"
  config.use_transactional_fixtures = true
  config.infer_spec_type_from_file_location!
  config.filter_rails_from_backtrace!
  config.include Devise::Test::ControllerHelpers, type: :controller
end

RSpec.configure do |config|
  config.expect_with :rspec do |expectations|
    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
  end
  config.mock_with :rspec do |mocks|
  end
  config.shared_context_metadata_behavior = :apply_to_host_groups
=begin
  config.filter_run_when_matching :focus
  config.example_status_persistence_file_path = "spec/examples.txt"
  config.disable_monkey_patching!
  if config.files_to_run.one?
    config.default_formatter = "doc"
  end
  config.profile_examples = 10
  config.order = :random
  Kernel.srand config.seed
=end
end

这是我的spec_helper.rb

require 'support/factory_bot'
require 'spec_helper'
ENV['RAILS_ENV'] ||= 'test'
require File.expand_path('../../config/environment', __FILE__)
abort("The Rails environment is running in production mode!") if Rails.env.production?
require 'rspec/rails'
ActiveRecord::Migration.maintain_test_schema!
RSpec.configure do |config|
  config.fixture_path = "#{::Rails.root}/spec/fixtures"
  config.use_transactional_fixtures = true
  config.infer_spec_type_from_file_location!
  config.filter_rails_from_backtrace!
  config.include Devise::Test::ControllerHelpers, type: :controller
end

RSpec.configure do |config|
  config.expect_with :rspec do |expectations|
    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
  end
  config.mock_with :rspec do |mocks|
  end
  config.shared_context_metadata_behavior = :apply_to_host_groups
=begin
  config.filter_run_when_matching :focus
  config.example_status_persistence_file_path = "spec/examples.txt"
  config.disable_monkey_patching!
  if config.files_to_run.one?
    config.default_formatter = "doc"
  end
  config.profile_examples = 10
  config.order = :random
  Kernel.srand config.seed
=end
end

---

请帮助我了解为什么此测试不会影响测试数据库，以及如何更改此情况。

这是因为您有以下行：

config.use_transactional_fixtures = true

此设置的名称有点误导。这对我来说意味着什么 Rails在上下文中是“运行事务中的每个测试方法” 对于rspecrails，它意味着“运行事务中的每个示例”

我们的想法是从一个干净的数据库开始，创建 该示例所需的任何数据，然后删除该数据 只需在示例末尾回滚事务

见：