From: Josh Cheek <josh.cheek@...>
Date: 2013-06-18T01:06:55+09:00
Subject: Re: Comparing objects

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On Mon, Jun 17, 2013 at 10:52 AM, Thom T. <lists@ruby-forum.com> wrote:

> How do I compare two objects in Ruby, considering only attributes
> values?
>
> For example:
>
>   class Foo
>       attr_accessor :bar, :baz
>   end
>
>   lorem = Foo.new
>   ipsum = Foo.new
>
>   lorem.bar = 1
>   lorem.baz = 2
>
>   ipsum.bar = 1
>   ipsum.baz = 2
>
>   puts lorem == ipsum # false
>
> Both objects belongs to the same class and also have the same attributes
> values.
>
> Thanks.
>
>
I'd do it like this

class Foo
  attr_accessor :bar, :baz
  def ==(foo)
    foo.kind_of?(self.class) && bar == foo.bar && baz == foo.baz
  end
end

Only define <=> if your foos are ordered.

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On Mon, Jun 17, 2013 at 10:52 AM, Thom T. <span dir=3D"ltr">&lt;<a href=3D"=
mailto:lists@ruby-forum.com" target=3D"_blank">lists@ruby-forum.com</a>&gt;=
</span> wrote:<br><div class=3D"gmail_quote"><blockquote class=3D"gmail_quo=
te" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"=
>
How do I compare two objects in Ruby, considering only attributes<br>
values?<br>
<br>
For example:<br>
<br>
=A0 class Foo<br>
=A0 =A0 =A0 attr_accessor :bar, :baz<br>
=A0 end<br>
<br>
=A0 lorem =3D Foo.new<br>
=A0 ipsum =3D Foo.new<br>
<br>
=A0 lorem.bar =3D 1<br>
=A0 lorem.baz =3D 2<br>
<br>
=A0 ipsum.bar =3D 1<br>
=A0 ipsum.baz =3D 2<br>
<br>
=A0 puts lorem =3D=3D ipsum # false<br>
<br>
Both objects belongs to the same class and also have the same attributes<br=
>
values.<br>
<br>
Thanks.<br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br></font></span></blockquo=
te><div></div></div><div><br></div><div>I&#39;d do it like this</div><div><=
br></div><div><div>class Foo</div><div>=A0 attr_accessor :bar, :baz</div><d=
iv>
=A0 def =3D=3D(foo)</div><div>=A0 =A0 foo.kind_of?(self.class) &amp;&amp; b=
ar =3D=3D foo.bar &amp;&amp; baz =3D=3D foo.baz</div><div>=A0 end</div><div=
>end</div></div><div><br></div><div>Only define &lt;=3D&gt; if your foos ar=
e ordered.</div>

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