Pushing objects into a hash inside a loop - ruby

Question

I'm trying to achieve the following JSON results:
{
"movie" =>
[{
"title": "Thor",
"year" : 2011,
},
{
"title": "Iron Man",
"year" : 2008,
}],
"tv" =>
[{
"title": "Parks and Recreation"
"year": 2009
},
{
"title": "Friends"
"year": 1994
}]
}
With JavaScript, I would loop through my results and do something like:
results['movie'].push(item);
results['tv'].push(item);
With Ruby code, the farthest I've gone is this:
#results = Hash.new
results['Search'].each do |r|
if r['Type'] == 'movie'
#results['movie'] << {
'title' => r['Title'],
'year' => r['Year']
}
elsif r['Type'] == 'series'
#results['tv'] << {
'title' => r['Title'],
'year' => r['Year']
}
end
end
What am I missing here?

Answer 1

I think you can get what you want by using Enumerable#each_with_object and assigning a default value to the hash.
def group_search_results(items)
results = Hash.new { |hash, key| hash[key] = [] }
items.each_with_object(results) do |item|
results[item['Type']] << {'title' => item['Title'], 'year' => item['Year']}
end
end
describe "search_results" do
it "groups into an object" do
items = [
{'Type' => 'movie', 'Title' => 'Thor', 'Year' => 2011},
{'Type' => 'movie', 'Title' => 'Iron Man', 'Year' => 2008},
{'Type' => 'series', 'Title' => 'Parks and Recreation', 'Year' => 2009},
{'Type' => 'series', 'Title' => 'Friends', 'Year' => 1994},
]
results = group_search_results(items)
expect(results).to eq({
'movie' => [
{'title' => 'Thor', 'year' => 2011},
{'title' => 'Iron Man', 'year' => 2008},
],
'series' => [
{'title' => 'Parks and Recreation', 'year' => 2009},
{'title' => 'Friends', 'year' => 1994},
],
})
end
end

Answer 2

I believe the problem has to do with the initialization of your hash. The movie and tv keys aren't currently an array. You can initialize your hash like this:
#results = { 'movie' => [], 'tv' => [] }
Here's how it looks with the rest of your code:
#results = { 'movie' => [], 'tv' => [] }
results['Search'].each do |r|
if r['Type'] == 'movie'
#results['movie'] << {
'title' => r['Title'],
'year' => r['Year']
}
elsif r['Type'] == 'series'
#results['tv'] << {
'title' => r['Title'],
'year' => r['Year']
}
end
end

Answer 3

results = {
search: {
movie: [
{ title: 'Thor', year: 2011 },
{ title: 'Iron Man', year: 2008 },
],
tv: [
{ title: 'Parks and Recreation', year: 2009 },
{ title: 'Friends', year: 1994 },
]
}
}
#results = Hash.new{|k, v| k[v] = []}
results[:search].each do |type, array|
#results[type].push(*array)
end
results[:search].each_with_object(Hash.new{|k, v| k[v] = []}) do |(type, array), hash|
hash[type].push(*array)
end