How do I create an attribute accessor to do this

Ruby
1

I want to be able to do this to merge a hash into attribute bas on
instance bar in class foo;

bar = Foo.new
bar.bas << { :this => “that” }

Is there any way to define the accessor in Foo to be able to do this?

Thanks,
James

2

J2M wrote:

I want to be able to do this to merge a hash into attribute bas on
instance bar in class foo;

bar = Foo.new
bar.bas << { :this => “that” }

Is there any way to define the accessor in Foo to be able to do this?

Thanks,
James

class Hash
alias :<<, :merge!
end

class Foo
attr :bas
def initialize
@bas = {}
end
end

Is that what you had in mind?

T.

3

Hi –

On Mon, 25 Sep 2006, J2M wrote:

I want to be able to do this to merge a hash into attribute bas on
instance bar in class foo;

bar = Foo.new
bar.bas << { :this => “that” }

Is there any way to define the accessor in Foo to be able to do this?

Here’s one way. It involves assigning a hash to @bar, and adding the
<< behavior to that hash (using a module).

require ‘test/unit’

class Foo

 attr_reader :bas

 module UpdateAppender
   def <<(other)
     update(other)
   end
 end

 def initialize
   @bas = {}.extend(UpdateAppender)
 end

end

class TestMerging < Test::Unit::TestCase
def test_1
f = Foo.new
f.bas << { :this => “that” }
assert_equal(f.bas.keys, [:this])
end
end

David

4

Thanks Trans, I will have a go tomorrow it is very late here in the UK
:slight_smile:

5

Thanks Trans, I will have a go tomorrow it is very late here in the UK
:slight_smile:

6

Thank you both for such quick responses. I will give this a go tomorrow
(v. late here in the UK).

David - thank you for all the time you take to help out us newbies, and
thank you for RailsConf Europe too - fan-tas-tic!