从块参数创建动态方法

Question

我有以下数据结构

array_of_hashes = [{"key"=>"2020-10-01",
  "foo"=>"100",
  "bar"=>38,
  "baz"=>19,
  "losem"=>19,
  "ipsum"=>0,
  ...},
...
]
state =  {["", nil, nil, nil, nil]=>
          #<MySimpleObject:0x0000557fb9fe4708
          @foo=0.0,
          @bar=0.0,
          @baz=0.0,
          @lorem=0.0,
          @ipsum=0.0,
          ...}

array_of_hashes.each_with_object(state) do |stats, memo|
  state = memo['key']

  state.foo = stats['foo'].to_d
  state.bar = stats['bar'].to_d
  state.baz = stats['baz'].to_d
  state.lorem = stats['lorem'].to_d
  state.ipsum = stats['ipsum'].to_d
  ...
end

在这种情况下我该如何跟干？我需要 smth 在运行时生成和执行方法，例如：

query.each_with_object(shared_state) do |stats, memo|
  state = memo['key']

  columns = %w[foo bar baz lorem ipsum ...]
  columns.each { |attribute|
    define_method attribute do #??????
      state.attribute = stats[attribute.to_s].to_d
    end
  }
end

据我所知define_method不适合这种情况。

Answer 1

简答，不要！这将使您的代码难以阅读。在我看来，您在第一个示例中所拥有的非常好。不是所有东西都需要干燥。

如果你真的很想做的话，可以用send

query.each_with_object(shared_state) do |stats, memo|
  state = memo['key']

  columns = %w[foo bar baz lorem ipsum ...]
  columns.each do |attribute|
    state.send("#{attribute}=", stats[attribute].to_d) 
  end
end

https://apidock.com/ruby/Object/send

从块参数创建动态方法

Dynamic method creation from block parameter

ruby

algorithm

methods

hash

ruby-on-rails