Ruby on Rails中的JSON解析

Question

Im trying to get the value for "query"

[
    {
        "query"=> "cat",
        "search_type_names"=> [
            "in Handmade"
        ],
        "search_types"=> [
            "handmade"
        ]
    },
    {
        "query"=> "dream catcher",
        "search_type_names"=> [
            "in Handmade"
        ],
        "search_types"=> [
            "handmade"
        ]
    },
    {
        "query"=> "cat ears",
        "search_type_names"=> [
            "in Handmade"
        ],
        "search_types"=> [
            "handmade"
        ]
    },
    {
        "query"=> "cat collar",
        "search_type_names"=> [
            "in Handmade"
        ],
        "search_types"=> [
            "handmade"
        ]
    },
    {
        "query"=> "cat costume",
        "search_type_names"=> [
            "in Handmade"
        ],
        "search_types"=> [
            "handmade"
        ]
    },
    {
        "query"=> "cat shirt",
        "search_type_names"=> [
            "in Handmade"
        ],
        "search_types"=> [
            "handmade"
        ]
    },
    {
        "query"=> "cat ring",
        "search_type_names"=> [
            "in Handmade"
        ],
        "search_types"=> [
            "handmade"
        ]
    },
    {
        "query"=> "cat toys",
        "search_type_names"=> [
            "in Handmade"
        ],
        "search_types"=> [
            "handmade"
        ]
    },
    {
        "query"=> "cat bed",
        "search_type_names"=> [
            "in Handmade"
        ],
        "search_types"=> [
            "handmade"
        ]
    },
    {
        "query"=> "cheshire cat",
        "search_type_names"=> [
            "in Handmade"
        ],
        "search_types"=> [
            "handmade"
        ]
    },
    {
        "query"=> "cat tree",
        "search_type_names"=> [
            "in Handmade"
        ],
        "search_types"=> [
            "handmade"
        ]
    },
    {
        "link"=> "/search/shops?search_query=cat",
        "query"=> "find shop names containing cat",
        "search_type_names"=> [],
        "search_types"=> []
    }
]

Answer 1

It appears you've already converted the JSON string to an array, which I call arr , in which case:

arr.map { |h| h["query"] }
  #=> ["cat", "dream catcher", "cat ears", "cat collar", "cat costume",
  #    "cat shirt", "cat ring", "cat toys", "cat bed", "cheshire cat",
  #    "cat tree", "find shop names containing cat"] 

Answer 2

Since that JSON is an array, you'll have to first choose one of the elements from the array, and then use the key for the hash to extract 'query'

json.first['query']
json[5]['query']

Answer 3

让json_array是您拥有的JSON数组，您也可以通过这种方式获取query ：

json_array.each { |a| puts a['query'] }

Answer 4

You can try this.Lets you have a a that the array of JSON

irb(main):151:0> a.collect{|h| h["query"]}
=> ["cat", "dream catcher", "cat ears", "cat collar", "cat costume", "cat shirt", "cat ring", "cat toys", "cat bed", "cheshire cat", "cat tree", "find shop names containing cat"]