rspec rails，实例应匹配数组中的元素

Question

I have a Panel class which has an array. All instances of that class have to contain one of the elements of that array.

  TEXT_ONLY = "text_only"
  IMAGE_LEFT = "image_left"
  IMAGE_RIGHT = "image_right"
  IMAGE_ONLY = "image_only"
  VIDEO = "video"
  PANEL_TYPE = [TEXT_ONLY, IMAGE_LEFT, IMAGE_RIGHT, IMAGE_ONLY, VIDEO]

  validate :panel_type, inclusion: PANEL_TYPE.each

I am trying to write a test that matches this validation.

  mandatory_string_from_collection :panel_type, CorporatePanel::PANEL_TYPE.each

  def mandatory_string_from_collection(method,collection)
    context "#{method} is a mandatory string" do
      exists(method)
      it "should reject a blank #{method}" do
        @instance.send("#{method}=","")
        expect(@instance).not_to be_valid
      end
      context "where the value is not within the acceptable options" do
        it "should reject it" do
          @instance.send("#{method}=","zgodnflax")
          expect(@instance).to_not be_valid
        end
      end
      context "where the value is within the acceptable options" do
        it "should accept it" do
          @instance.send("#{method}=",collection.first)
          expect(@instance).to be_valid
        end
      end
    end
  end

Here is the factory

this i my factory

factory :corporate_panel do
    corporate_page
    section 1
    panel_type "video"
    title "MyString"
    headline "MyString"
    body "MyText"
    # workflow_state "MyString"
  end

the test yields this, and i do not understand why?!

 1) CorporatePanel panel_type is a mandatory string should reject a blank panel_type
     Failure/Error: expect(@instance).not_to be_valid
       expected #<CorporatePanel id: 353, corporate_page_id: 464, section: 1, position: 1, panel_type: "", title: "MyString", headline: "MyString", body: "MyText", workflow_state: "draft", created_at: "2014-08-11 22:49:26", updated_at: "2014-08-11 22:49:26", asset_id: nil> not to be valid
     # -e:1:in `<main>'

  2) CorporatePanel panel_type is a mandatory string where the value is not within the acceptable options should reject it
     Failure/Error: expect(@instance).to_not be_valid
       expected #<CorporatePanel id: 355, corporate_page_id: 466, section: 1, position: 1, panel_type: "zgodnflax", title: "MyString", headline: "MyString", body: "MyText", workflow_state: "draft", created_at: "2014-08-11 22:49:26", updated_at: "2014-08-11 22:49:26", asset_id: nil> not to be valid

Answer 1

This

validate :panel_type, inclusion: PANEL_TYPE.each

should just be

validate :panel_type, inclusion: PANEL_TYPE

You are validating that panel_type is in the set PANEL_TYPE (also, I'd call it PANEL_TYPES because there's more than one in the set)

Secondly, you do not want to do this each either

mandatory_string_from_collection :panel_type, CorporatePanel::PANEL_TYPE.each

if what you want is "I want to check that for each PANEL_TYPE that it is ok to use" then what you probably want is this:

CorporatePanel::PANEL_TYPE.each do |panel_type|
  mandatory_string_from_collection :panel_type, panel_type
end