如何使用键作为数组值创建json

For example, I got an array = [zoo, foo, bar, ...].

例如,我有一个数组= [zoo,foo,bar,...]。

I need to create json with hash, where keys is array's values, and hash's values is another hashes Something like this:

我需要使用hash创建json,其中keys是数组的值,而hash的值是另一个哈希值,如下所示:

"model_field": {
   "zoo": {
      "name": "zoo",
      "key2": "value2",
      "key3": "value3"
   },
   "foo": {
      "name": "foo",
      "key2": "value2",
      "key3": "value3"
   },
  ...
}

I tried to do something like this

我试着这样做

def json
  render json: {model_field: {array.each do |x|
      {x => {name: x, key2: "value2", key3: "value3"}
      }
    end
    }
  }
end

but than i'm stuck. Can anyone help me?

但是我被卡住了。谁能帮我?

1 个解决方案

#1

each returns the object you iterated on, no matter what you did inside the loop:

无论你在循环中做了什么,每个都返回你迭代的对象:

%w[zoo foo bar].each { |x|  } # => ["zoo", "foo", "bar"]

Something you could do is each_with_object to pass a hash to each iteration and fill it. This returns the object you passed in, after the final iteration:

你可以做的就是each_with_object将散列传递给每次迭代并填充它。在最后一次迭代之后,这将返回您传入的对象:

array = %w[zoo foo bar]

output = {
  model_field: array.each_with_object({}) do |x, hash|
    hash[x] = { name: x, key2: rand(1..100) }
  end
}
# => {
#      :model_field=>{
#        "zoo"=>{:name=>"zoo", :key2=>25},
#        "foo"=>{:name=>"foo", :key2=>83},
#        "bar"=>{:name=>"bar", :key2=>98}
#      }
#    }

#1