在super中更新ruby hash中的单个值(Update single value in ruby hash from super)

在super中更新ruby hash中的单个值(Update single value in ruby hash from super)

我在rspec中编写测试，并试图用let声明一些变量。

describe 'my_test' do let(:params) {{ :happy => 1, :sad => 0, }} context 'mixed' do let(:params) {{ :happy => 1, :sad => 1, }} end end

但是后来我看到了super变量如何被写出来，这对长参数列表很方便： http ://myronmars.to/n/dev-blog/2013/02/rspec-2-13-is-released

所以我的问题是，如何覆盖原始散列中的单个值？ 我试过搜索，但只能找到覆盖所有值的方法。 像下面这样的东西存在吗？

let(:hash) { super().updatehash('sad', '1') }

I'm writing tests in rspec and am trying to declare some variables with let.

describe 'my_test' do let(:params) {{ :happy => 1, :sad => 0, }} context 'mixed' do let(:params) {{ :happy => 1, :sad => 1, }} end end

But then I saw how variables can be ovewritten with super, which would be convenient for long lists of params: http://myronmars.to/n/dev-blog/2013/02/rspec-2-13-is-released

So my question is, how do I overwrite just a single value in the original hash? I've tried searching but can only find ways to overwrite all values. Does anything like below exist?

let(:hash) { super().updatehash('sad', '1') }

最满意答案

您可以使用散列＃合并重载散列变量

let(:hash) { super().merge(:sad => '1') }

它将使用您在散列中提供的键值对来覆盖原始散列中的任何键值以合并它。

如果你想链接到合并的doco，apidock是很好的：

http://apidock.com/ruby/Hash/merge

You can overload hash variables using Hash#merge

let(:hash) { super().merge(:sad => '1') }

it will overwrite any key-values in the original hash with the key-value pairs you provide in the hash to merge over it.

If you'd like a link to the doco for merge, apidock is good:

http://apidock.com/ruby/Hash/merge