ruby-on-rails - 如何在 Rails 中将数组对象转换为散列

Question

我有一个带有数组对象的散列:

{
  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>]
} 

如何将上面的hash转化为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]}}}

如果您可以使用select_all 方法获取散列数组，而不是对象数组，那么您就不需要将对象转换为散列。

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