Convert a JSON value to another JSON shape? - json

Question

I have the following JSON file that I need to transform.
Original JSON file:
{
"configs": [
{
"ignore": "this",
"key": "abc123",
"default": false
},
{
"ignore": "that",
"key": "def123",
"default": "#F5F5F5"
},
{
"type": "color",
"key": "ghi123",
"default": "#3d4246"
}
]
}
I want to convert the JSON to look like this:
{
"configs": [
{
"abc123": false
},
{
"def123": "#F5F5F5"
},
{
"ghi123": "#3d4246"
}
]
}
How can I do this?
require 'json'
original_json = JSON.parse("...") #original JSON shape

Answer 1

There's likely a cleaner way, but here's a shot:
require 'json'
original_json = JSON.parse('{
"configs": [
{
"ignore": "this",
"key": "abc123",
"default": false
},
{
"ignore": "that",
"key": "def123",
"default": "#F5F5F5"
},
{
"type": "color",
"key": "ghi123",
"default": "#3d4246"
}
]
}')
original_json['configs'].each do |h|
k = h["key"]
v = h["default"]
h.clear
h[k] = v
end
original_json.to_json
#=> {"configs":[{"abc123":false},{"def123":"#F5F5F5"},{"ghi123":"#3d4246"}]}

Answer 2

With Enumerable#each_with_object you can create new hash as you want. Then you can convert it to json.
original_hash = JSON.parse(original_json)
new_hash = original_hash[:configs].each_with_object({ configs: [] }) do |item, new_hash|
new_hash[:configs] << {
item[:key] => item[:default]
# add another key value pair if you want
}
end
new_hash.to_json
#=> {
# "configs": [
# {
# "abc123": false
# },
# {
# "def123": "#F5F5F5"
# },
# {
# "ghi123": "#3d4246"
# }
# ]
# }