Rails将类似散列的对象转换为散列？

Question

有投单的方式：一个Hash

• Hash
• HashWithIndifferentAccess
• ActionController:Parameters

？

我有一个序列化的属性，它看起来像所有3种类型都在数据库表中。

Answer 1

您可以使用：

hash_like_object.to_h 

测试与Array of arrays，Hash，HashWithIndifferentAccess和ActionController::Parameters：

array  = [[:a,1],[:b,2]] 
hash  = {a: 1, b: 2} 
hash2  = HashWithIndifferentAccess.new(a: 1, b: 2) 
parameters = ActionController::Parameters.new(a: 1, b: 2) 

[array, hash, hash2, parameters].each do |hash_like_object| 
    h = hash_like_object.to_h 
    puts "%s (%s) -> %s (%s)" % [hash_like_object, hash_like_object.class, h, h.class] 
end 

# [[:a, 1], [:b, 2]] (Array) -> {:a=>1, :b=>2} (Hash) 
# {:a=>1, :b=>2} (Hash) -> {:a=>1, :b=>2} (Hash) 
# {"a"=>1, "b"=>2} (ActiveSupport::HashWithIndifferentAccess) -> {"a"=>1, "b"=>2} (Hash) 
# {"a"=>1, "b"=>2} (ActionController::Parameters) -> {"a"=>1, "b"=>2} (Hash)