Merging records in JSON with Ruby - ruby

Question

I have two json files that I'm trying to merge. The JSONs have different formatting (see below). I'd like to merge records, so [0] from file one and [0] from file two would become one record [0] in the new merged file.
The first JSON (file_a.json), appears like so:
{
"query": {
"count": 4,
"created": "2012-11-21T23:07:00Z",
"lang": "en-US",
"results": {
"quote": [
{
"Name": "Bill",
"Age": "46",
"Number": "3.55"
},
{
"Name": "Jane",
"Age": "33",
"Number": nil
},
{
"Name": "Jack",
"Age": "55",
"Number": nil
},
{
"Name": "Xavier",
"Age": nil,
"Number": "153353535"
}
]
}
}
}
The second JSON (file_b.json) appears like so:
[
{
"Number2": 25253,
"Number3": 435574,
"NAME": "Bill"
},
{
"Number2": 345353,
"Number3": 5566,
"NAME": "Jane"
},
{
"Number2": 56756,
"Number3": 232435,
"NAME": "Jack"
},
{
"Number2": 7457,
"Number3": 45425,
"NAME": "Xavier"
}
]
None of the keys are the same in both JSONs (well, actually "Name" is a key in both, but in the first the key is "Name" and in the second its "NAME" - just so I can check that the merge works correctly - so I want "Name" and "NAME" in the final JSON), the first record in the first file matches with the first record in the second file, and so on.
So far, I tried merging like this:
merged = %w[a b].inject([]) { |m,f| m << JSON.parse(File.read("file_#{f}.json")) }.flatten
But this of course merged them, but not how I wanted them merged (they are merged sucessively, and because of the different formatting, it gets quite ugly).
I also tried merging like this:
a = JSON.parse(File.read("file_a.json"))
b = JSON.parse(File.read("file_b.json"))
merged = a.zip(b)
Came closer but still not correct and the formatting was still horrendous.
In the end, what I want is this (formatting of second JSON - headers from first JSON can be junked):
[
{
"Name": "Bill",
"Age": 46,
"Number": 3.55,
"Number2": 25253,
"Number3": 435574,
"NAME": "Bill"
},
{
"Name": "Jane",
"Age": 33,
"Number": nil,
"Number2": 345353,
"Number3": 5566,
"NAME": "Jane"
},
{
"Name": "Jack",
"Age": 55,
"Number": nil,
"Number2": 56756,
"Number3": 232435,
"NAME": "Jack"
},
{
"Name": "Xavier",
"Age": nil,
"Number": 153353535,
"Number2": 7457,
"Number3": 45425,
"NAME": "Xavier"
}
]
Any help is appreciated. Thanks a lot.

Answer 1

Hеllo, seems format changed from last time :)
UPDATE: more readable version that also convert corresponding values to integers/floats:
require 'json'
require 'ap'
a = JSON.parse(File.read('./a.json'))['query']['results']['quote'] rescue []
b = JSON.parse(File.read('./b.json'))
final = []
a.each_with_index do |ah,i|
unless bh = b[i]
bh = {}
puts "seems b has no #{i} key, merging skipped"
end
final << ah.merge(bh).inject({}) do |f, (k,v)|
if v.is_a?(String)
if v =~ /\A\d+\.\d+\Z/
v = v.to_f
elsif v =~ /\A\d+\Z/
v = v.to_i
end
end
f.update k => v
end
end
ap final
will display:
[
[0] {
"Name" => "Bill",
"Age" => 46,
"Number" => 3.55,
"Number2" => 25253,
"Number3" => 435574,
"NAME" => "Bill"
},
[1] {
"Name" => "Jane",
"Age" => 33,
"Number" => nil,
"Number2" => 345353,
"Number3" => 5566,
"NAME" => "Jane"
},
[2] {
"Name" => "Jack",
"Age" => 55,
"Number" => nil,
"Number2" => 56756,
"Number3" => 232435,
"NAME" => "Jack"
},
[3] {
"Name" => "Xavier",
"Age" => nil,
"Number" => 153353535,
"Number2" => 7457,
"Number3" => 45425,
"NAME" => "Xavier"
}
]
Here is a working demo
Btw, your json is a bit wrong in both files.
See the fixed versions here and here