CODEWITHSUNDEEP
ruby
Ved
Ved

Reputation: 3500

TypeError while iterating through a Hash

I have the following hash:

{
  "groups" => [
    {
      "type" => "Nearby", 
      "venues" => [
        {
          "id" => 4450132, 
          "name" => "Position2", 
          "address" => "Domlur", 
          "city" => "Bangalore", 
          "state" => "Karnataka/India", 
          "zip" => "560037", 
          "verified" => false, 
          "geolat" => 12.9566921, 
          "geolong" => 77.6407258, 
          "stats" => {
            "herenow" => "0"
          }, 
          "twitter" => "position2", 
          "hasTodo" => "false", 
          "distance" => 0
          },...

I want to iterate through it and find all the 'name' attributes. My code looks like:

response["groups"]["Nearby"]["venues"].each do |key|
  logger.debug key['name']
end

But I keep on getting error:

TypeError (can't convert String into Integer):

I am on ruby 1.9.

Upvotes: 0

Views: 419

Answers (3)

the Tin Man
the Tin Man

Reputation: 160551

If I clean up the hash so it's properly balanced:

data = {
  "groups" => [
    {
      "type" => "Nearby",
      "venues" => [
        {
          "id" => 4450132,
          "name" => "Position2",
          "address" => "Domlur",
          "city" => "Bangalore",
          "state" => "Karnataka/India",
          "zip" => "560037",
          "verified" => false,
          "geolat" => 12.9566921,
          "geolong" => 77.6407258,
          "stats" => {
            "herenow" => "0"
          },
          "twitter" => "position2",
          "hasTodo" => "false",
          "distance" => 0
        }
      ]
    }
  ]
}

I can iterate over the hash finding the 'name' keys using:

data['groups'].map{ |i| i['venues'].map{ |j| j['name'] } } # => [["Position2"]]

Because the data is nested, the resulting extracted data will be nested. To flatten it use flatten:

data['groups'].map{ |i| i['venues'].map{ |j| j['name'] } }.flatten # => ["Position2"]

Upvotes: 1

Mihai Toader
Mihai Toader

Reputation: 12243

use this:

response["groups"][0]["venues"].each do |key|
 logger.debug key['name']
end

The reason is that your response["groups"] object is actually an array and not a map.

Upvotes: 1

sepp2k
sepp2k

Reputation: 370122

response["groups"] is an Array. Arrays are indexed by integers, not strings.

If you want to get the group, whose type is "Nearby" you can use:

response["groups"].find {|h| h["type"] == "Nearby}["venues"].each ...

Upvotes: 3

Related Questions