Rails - Jul 2006 - DRY? Converting Boolean to Yes/No

I have a database column given as:

t.column :change_address, :boolean

The user interacts with this using a checkbox, but wants confirmations to
read:

Change address: Yes

In an isolated case something like:

@obj.change_address ? ''Yes'' : ''No''

Would work fine but this is peppered throughout scads of forms and boolean
fields. The first step I took at DRYing this up was:

class TrueClass
  def to_s
    "Yes"
  end
end

class FalseClass
  def to_s
    "No"
  end
end

But this breaks other uses. For example observe_field constructs the
observers based on the to_s conversion of boolean attributes.

Any ideas on how to DRY this usage up?

Thanks
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You could try something like:
def change_address?
  self.change_address ? "Yes" : "No"
end

in the model.

Steve Ross wrote:
> I have a database column given as:
> 
> t.column :change_address, :boolean
> 
> The user interacts with this using a checkbox, but wants confirmations 
> to
> read:
> 
> Change address: Yes
> 
> In an isolated case something like:
> 
> @obj.change_address ? ''Yes'' : ''No''
> 
> Would work fine but this is peppered throughout scads of forms and 
> boolean
> fields. The first step I took at DRYing this up was:
> 
> class TrueClass
>   def to_s
>     "Yes"
>   end
> end
> 
> class FalseClass
>   def to_s
>     "No"
>   end
> end
> 
> But this breaks other uses. For example observe_field constructs the
> observers based on the to_s conversion of boolean attributes.
> 
> Any ideas on how to DRY this usage up?
> 
> Thanks
> --
> View this message in context: 
>
http://www.nabble.com/DRY--Converting-Boolean-to-Yes-No-tf1957326.html#a5368812
> Sent from the RubyOnRails Users forum at Nabble.com.

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I created a ''prettifier'' plugin that extended TrueClass and
FalseClass
with a ''prettier'' method that gave me a Yes/No response.  More
useful if
you need the Yes/No to be available across the board.  Yehuda''s
response
should be sufficient if you just need it for one column.

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Yes, this handles the individual case in questions, but I have dozens of
models and many of them have one or more boolean attributes. The larger
question, then, is how to generalize the pattern?

Thanks

wycats wrote:
> 
> You could try something like:
> def change_address?
>   self.change_address ? "Yes" : "No"
> end
> 
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Where is the plugin or could you post relevant code?


Philip Schalm wrote:
> 
> I created a ''prettifier'' plugin that extended TrueClass
and FalseClass
> with a ''prettier'' method that gave me a Yes/No response.
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./script/generate plugin pretty_boolean

And then modify/create the following two files:
# <RAILS_APP>/vendor/plugins/pretty_boolean/init.rb
# Include hook code here
require ''pretty_boolean''
# End init.rb

# <RAILS_APP>/vendor/plugins/pretty_boolean/lib/pretty_boolean.rb
# PrettyBoolean
module PrettyBoolean
        def prettier
                self ? "yes" : "no"
        end
end

class FalseClass
        include PrettyBoolean
end

class TrueClass
        include PrettyBoolean
end
# End PrettyBoolean

and, as long as the plugin is working, you can take any boolean you want 
and go
some_boolean.prettier

and it''ll return "yes" or "no"

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Steve Ross wrote:
> Where is the plugin or could you post relevant code?
> 
> 
> Philip Schalm wrote:
>> 
>> I created a ''prettifier'' plugin that extended
TrueClass and FalseClass
>> with a ''prettier'' method that gave me a Yes/No
response.
> --
> View this message in context: 
>
http://www.nabble.com/DRY--Converting-Boolean-to-Yes-No-tf1957326.html#a5369356
> Sent from the RubyOnRails Users forum at Nabble.com.
I think that we''re posting in between eachother here... I just posted 
the relevant code :D

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