Question

我正试图通过这个rspec

describe "title" do
it "should capitalize the first letter" do
  @book.title = "inferno"
  expect(@book.title).to eq("Inferno")
end

it "should capitalize every word" do
  @book.title = "stuart little"
  expect(@book.title).to eq("Stuart Little")
end

使用此代码

class Book
  attr_accessor :title

  def initialize(title="")
    @title = capital(title)
  end

  def capital(title)
    articles = %w(the a an and of in the)
    new_title = []

    title.split.each do |w|
      articles.include?(w)? new_title << w : new_title << w.capitalize
      end

    new_title[0] = new_title[0].capitalize
    new_title.join(" ")
  end

end

book = Book.new("stuart little")
puts book.title

当我运行代码时，我得到“Stuart Little”，但是当我通过rspec运行它时，我一直收到错误。（例如，它只是以“stuart little”的形式返回）。

我很清楚为什么会发生这种情况，所以我希望有人可以为我提供一些启示。

Answer 1

当您为capital方法分配标题时，您只运行new方法，而不是在将其分配给title= setter方法时运行。

我会将attr_accessor替换为attr_reader并添加自定义title= setter方法：

class Book
  attr_reader :title

  def initialize(title = '')
    self.title = title # calls the setter below
  end

  def title=(title)
    @title = capital(title)
  end

private

  def capital(string)
    articles = %w( a an and in of the )

    words = title.split.map do |word|
      articles.include?(word) ? word : w.capitalize
    end

    words.join(' ').capitalize
  end
end

麻烦通过rspec

1 个答案: