Ruby convert Object to Hash

Ruby convert Object to Hash

Let's say I have a Gift object with @name = "book" & @price = 15.95. What's the best way to convert that to the Hash {name: "book", price: 15.95} in Ruby, not Rails (although feel free to give the Rails answer too)?

Answer by Dominic for Ruby convert Object to Hash

You should override the inspect method of your object to return the desired hash, or just implement a similar method without overriding the default object behaviour.

If you want to get fancier, you can iterate over an object's instance variables with object.instance_variables

Answer by Vasiliy Ermolovich for Ruby convert Object to Hash

class Gift    def initialize      @name = "book"      @price = 15.95    end  end    gift = Gift.new  hash = {}  gift.instance_variables.each {|var| hash[var.to_s.delete("@")] = gift.instance_variable_get(var) }  p hash # => {"name"=>"book", "price"=>15.95}  

Alternatively with each_with_object:

gift = Gift.new  hash = gift.instance_variables.each_with_object({}) { |var, hash| hash[var.to_s.delete("@")] = gift.instance_variable_get(var) }  p hash # => {"name"=>"book", "price"=>15.95}  

Answer by tokland for Ruby convert Object to Hash

class Gift    def to_hash      instance_variables.map do |var|        [var[1..-1].to_sym, instance_variable_get(var)]      end.to_h    end  end  

Answer by levinalex for Ruby convert Object to Hash

Implement #to_hash?

class Gift    def to_hash      hash = {}      instance_variables.each {|var| hash[var.to_s.delete("@")] = instance_variable_get(var) }      hash    end  end      h = Gift.new("Book", 19).to_hash  

Answer by mcm for Ruby convert Object to Hash

For Active Record Objects

module  ActiveRecordExtension    def to_hash      hash = {}; self.attributes.each { |k,v| hash[k] = v }      return hash    end  end    class Gift < ActiveRecord::Base    include ActiveRecordExtension    ....  end    class Purchase < ActiveRecord::Base    include ActiveRecordExtension    ....  end  

and then just call

gift.to_hash()  purch.to_hash()   

Answer by Erik Reedstrom for Ruby convert Object to Hash

Gift.new.instance_values # => {"name"=>"book", "price"=>15.95}  

Answer by andoke for Ruby convert Object to Hash

You should try Hashie, a wonderful gem : https://github.com/intridea/hashie

Answer by Austin Marusco for Ruby convert Object to Hash

Just say (current object) .attributes

.attributes returns a hash of any object. And it's much cleaner too.

Answer by mustafaturan for Ruby convert Object to Hash

Recursively convert your objects to hash using 'hashable' gem (https://rubygems.org/gems/hashable) Example

class A    include Hashable    attr_accessor :blist    def initialize      @blist = [ B.new(1), { 'b' => B.new(2) } ]    end  end    class B    include Hashable    attr_accessor :id    def initialize(id); @id = id; end  end    a = A.new  a.to_dh # or a.to_deep_hash  # {:blist=>[{:id=>1}, {"b"=>{:id=>2}}]}  

Answer by Sean for Ruby convert Object to Hash

Produces a shallow copy as a hash object of just the model attributes

my_hash_gift = gift.attributes.dup  

Check the type of the resulting object

my_hash_gift.class  => Hash  

Answer by Nate Symer for Ruby convert Object to Hash

You can write a very elegant solution using a functional style.

class Object    def hashify      Hash[instance_variables.map { |v| [v.to_s[1..-1].to_sym, instance_variable_get v] }]    end  end  

Answer by Andreas Rayo Kniep for Ruby convert Object to Hash

If you are not in an Rails environment (ie. don't have ActiveRecord available), this may be helpful:

JSON.parse( object.to_json )  

Answer by Santiago for Ruby convert Object to Hash

If you need nested objects to be converted as well.

# @fn       to_hash obj {{{  # @brief    Convert object to hash  #  # @return   [Hash] Hash representing converted object  #  def to_hash obj    Hash[obj.instance_variables.map { |key|      variable = obj.instance_variable_get key      [key.to_s[1..-1].to_sym,        if variable.respond_to? <:some_method> then          hashify variable        else          variable        end      ]    }]  end # }}}  

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