Rails如何计算操作的响应代码

Question

Rails如何计算控制器操作的响应代码？

给定以下控制器操作:

def update
  respond_to do |format|
    if @user.update(user_params)
      format.html { redirect_to @user, notice: 'User was successfully updated.' }
      format.json { head :no_content }
    else
      format.html { render action: 'show' }
      format.json { render json: @user.errors, status: :unprocessable_entity }
    end
  end
end

(我使用相同的视图来显示和编辑记录)

有了这个积极的测试:

test "should update basic user information" do
  user = users(:jon)
  user.first_name="Jonas"
  put :update, :id => user.id, :merchant_user =>user.attributes
  assert_response :found
  user = Merchant::User.find(user.id)
  assert user.first_name == "Jonas", "Should update basic user information"
end

负面测试是这样的:

test "should not update user email for an existing email" do
  user = users(:jon)
  original_user_email = user.email
  existing_user_email = users(:doe)
  user.email=existing_user_email.email
  put :update, :id => user.id, :merchant_user =>user.attributes
  assert_response :success
  user = Merchant::User.find(user.id)
  assert user.email == original_user_email, "Should not update email for an exising one"
end

成功更新记录会产生302响应代码,我认为GET资源/:ID的rails默认为302.无法更新记录会导致200 OK.

如何计算这些响应代码以及如何覆盖它们？

谢谢

Answer 1

请参阅下面的内联评论

if @user.update(user_params)
  format.html { redirect_to @user, notice: 'User was successfully updated.' }
  # 302, the save was successful but now redirecting to the show page for updated user
  # The redirection happens as a “302 Found” header unless otherwise specified.

  format.json { head :no_content }
  # 204, successful update, but don't send any data back via json

else
  format.html { render action: 'show' }
  # 200, standard HTTP success, note this is a browser call that renders 
  # the form again where you would show validation errors to the user

  format.json { render json: @user.errors, status: :unprocessable_entity }
  # 422, http 'Unprocessable Entity', validation errors exist, sends back the validation errors in json

end

如果你看format.json { render json: @user.errors, status: :unprocessable_entity }它使用status的选项render,以更明确一些HTTP状态代码,这样你可以做render action: 'show', status: 422或者render action: 'show', status: :unprocessable_entity,如果你想(你可能没有) -和渲染默认为200 Ok(Rails使用一个符号:success别名:ok,以及

也可以看看:

• http://api.rubyonrails.org/classes/ActionController/Redirecting.html
• http://api.rubyonrails.org/classes/ActionController/Head.html

看到四处访问:NOT_FOUND,:对Rails 3 INTERNAL_SERVER_ERROR等 在控制台Rack::Utils::HTTP_STATUS_CODES查看所有状态代码(该值在轨符号),即Unprocessable Entity是:unprocessable_entity