如何将哈希元素添加到另一个哈希？

Question

I do not seem to be able to add items to a hash.

I have the following method that has a hash passed in and the intent is to pass out a new hash made from the original. I have verified that the key is a string and the other two elements are floats. b_name, lat and lng all print to the logs when I request.

def construct_paint_hash(list)
    full_list = Hash.new
    num = 100
    list.each do |thing|

        puts num
        b_name = thing["name"]
        puts b_name
        lng = thing["longitude"]
        lat = thing["latitude"]
        full_list["#{b_name}"]=[lng, lat]
        # full_list[:dsfsd] = "dsfdsfds"
        num +=100 
    end
    return full_list
end

Here is the error I am getting:

Completed 500 Internal Server Error in 377ms (ActiveRecord: 0.0ms)

TypeError (no implicit conversion of String into Integer):
  app/controllers/welcome_controller.rb:42:in `[]'
  app/controllers/welcome_controller.rb:42:in `block in construct_paint_hash'
  app/controllers/welcome_controller.rb:39:in `each'
  app/controllers/welcome_controller.rb:39:in `construct_paint_hash'
  app/controllers/welcome_controller.rb:11:in `index'

What the heck am I doing wrong here?

Answer 1

Your code seems okay, but you can use the following code snippet . I assume your list params as following

list = [{"name" => "dhaka", "longitude" => 23.44, "latitude" => 24.55}, {"name" => "usa", "longitude" => 23.44, "latitude" => 24.55}]

Then rewrite your construct_paint_hash as following

def self.construct_paint_hash(list)
    data = list.collect { |l| {l["name"] => [l["longitude"], l["latitude"]]} }
    return data.inject(:merge)
end