Like a hidden array object hash in rails

Question

I have a hash with an array object:

{
  false=>[#<Campaign id: 1, name: "campaign 1", active: false>, #<Campaign id: 3, name: "campaign 3", active: false>, #<Campaign id: 4, name: "campaign 4", active: false>], 
  true=>[#<Campaign id: 2, name: "campaign 2", active: true>]
} 

how to convert above hash to hash

{
  false=>[{id:1, name:"campaign 1"}, {id:3, name: "capaign 3"}, ....],
  true =>[{id:2, name:"campaign 2"}]
}

Answer 1

hash.each {|k,v| hash[k] = v.map{|e| {id: e[:id], name: e[:name]}}}

and if you can use the method select_all, get a hash array, not an object array, so you don't need to hide the object for the hash.

ModelName.connection.select_all("select id, name from <table_name>;")
=> [{id:xxx, name: xxx}.......]

Answer 2

Use the attributes method for your object.

attributes () public

Returns a hash of all attributes with names in the form of keys and attribute values ​​as values.

hash = {
  false => [#<Campaign id: 1, name: "campaign 1", active: false>, #<Campaign id: 3, name: "campaign 3", active: false>, #<Campaign id: 4, name: "campaign 4", active: false>], 
  true  => [#<Campaign id: 2, name: "campaign 2", active: true>]
} 

So this line should do the trick -

hash.each {|k, v| hash[k] = v.map(&:attributes) }

{
  false => [{"id": 1, "name": "campaign 1", "active": false}, {"id": 3, "name": "campaign 3", "active": false}, {"id": 4, "name": "campaign 4", "active": false}], 
  true  => [{"id": 2, "name": "campaign 2", "active": true}]
}