Parsing table in Ruby - ruby

Question

For learning purpose, i wanted to parse db table and save in a hash based on type for example table looks like:
source table in json format look like:
[
{"id": 1 , "type": "Atest", "ip":"10.2.0.1", "port":1234, "description": "xyz"},
{"id": 2 , "type": "Btest", "ip":"10.2.0.2", "port":3000, "description": "xyz"},
{"id": 3 , "type": "subtest", "ip":"10.2.0.3", "port":3001, "description": "xyz"},
{"id": 4 , "type": "Atest", "ip":"10.2.0.4", "port":9999, "description": "xyz"},
{"id": 5 , "type": "subtest", "ip":"10.2.0.5", "port":1235, "description": "xyz"},
{"id": 6 , "type": "Ctest", "ip":"10.2.0.6", "port":1111, "description": "xyz"},
{"id": 7 , "type": "Btest", "ip":"10.2.0.7", "port":2222, "description": "xyz"},
{"id": 8 , "type": "subtest", "ip":"10.2.0.8", "port":3333, "description": "xyz"}
]
what i like to do is to parse this table with only type (Atest and Btest) and save to a hash like
hash_result ={type: Atest {id: 1 ,description: xyz}, type: Btest {id:2 ,description: xyz}, type: Atest {id: 4 ,description: xyz} , type: Btest {id: 7 ,description: xyz}}
what i am thinking is to have a switch case on type like
hash_result={}
when type == "Atest"
hash_result.append(...)
when type == "Btest"
hash_result.append(...)
Result:
hash_result ={type: Atest {id: 1 ,description: xyz}, type: Btest {id:2 ,description: xyz}, type: Atest {id: 4 ,description: xyz} , type: Btest {id: 7 ,description: xyz}}
But i am not sure how to do this, in the end I also like to know after i have a hash_result, how to search for specific [id] and print its type. I will appreciate any guidance

Answer 1

Since your result hash is not a valid Hash I only assume the wanted result and give you general idea how to achieve it. Also I'm not sure if you prefer strings or symbols as the Hash keys. Since your data example uses symbols, I will stick with it.
For filtering use Hash#select to find an element based on ID use Enumerable#find
data = [
{"id": 1 , "type": "Atest", "ip":"10.2.0.1", "port":1234, "description": "xyz"},
{"id": 2 , "type": "Btest", "ip":"10.2.0.2", "port":3000, "description": "xyz"},
{"id": 3 , "type": "subtest", "ip":"10.2.0.3", "port":3001, "description": "xyz"},
{"id": 4 , "type": "Atest", "ip":"10.2.0.4", "port":9999, "description": "xyz"},
{"id": 5 , "type": "subtest", "ip":"10.2.0.5", "port":1235, "description": "xyz"},
{"id": 6 , "type": "Ctest", "ip":"10.2.0.6", "port":1111, "description": "xyz"},
{"id": 7 , "type": "Btest", "ip":"10.2.0.7", "port":2222, "description": "xyz"},
{"id": 8 , "type": "subtest", "ip":"10.2.0.8", "port":3333, "description": "xyz"}
]
filtered = data.select{ |d| %w(Atest Btest).include? d[:type] };
# => [
# {:id=>1, :type=>"Atest", :ip=>"10.2.0.1", :port=>1234, :description=>"xyz"},
# {:id=>2, :type=>"Btest", :ip=>"10.2.0.2", :port=>3000, :description=>"xyz"},
# {:id=>4, :type=>"Atest", :ip=>"10.2.0.4", :port=>9999, :description=>"xyz"},
# {:id=>7, :type=>"Btest", :ip=>"10.2.0.7", :port=>2222, :description=>"xyz"}
# ]
result_hash = filtered.map{ |line| {line[:type].to_sym => line.select{ |key, value| %i(id description).include? key }} }
# => [
# {:Atest=>{:id=>1, :description=>"xyz"}},
# {:Btest=>{:id=>2, :description=>"xyz"}},
# {:Atest=>{:id=>4, :description=>"xyz"}},
# {:Btest=>{:id=>7, :description=>"xyz"}}
# ]
result_hash.find{|element| element.values.first[:id] == 2}
# => {:Btest=>{:id=>2, :description=>"xyz"}}