On Sun, Apr 4, 2010 at 11:46 AM, Chris Habgood <[email protected]> wrote:
> Is there not a way to form a string convert it to an attribute and then do
> Model.(string converted to attribute)?
>
>
Chris, you can do the following:
class Dynamic
name = foo
ivar = "@#{name}" # form the string
define_method( "#{name}=" ) do |value|
instance_variable_set( ivar, value ) # create an attribute
end
end
Also, you can do the above without using closures by doing
the following:
class Dynamic
name = "foo"
class_eval %{
def #{name}
@#{name}
end
def #{name}=(val)
@#{name} = val
end
}
end
However, it really depends what you're trying to do because it's not clear
from the question.
Good luck,
-Conrad
>
> On Sun, Apr 4, 2010 at 12:59 PM, Chris Habgood <[email protected]> wrote:
>
>> Ok, I was also looking at testing for nil? and stuff as well not only
>> setting the attr.
>>
>>
>> On Sun, Apr 4, 2010 at 12:57 PM, Frederick Cheung <
>> [email protected]> wrote:
>>
>>>
>>>
>>> On Apr 4, 6:50 pm, Chris Habgood <[email protected]> wrote:
>>> > Not looking at the value part looking at the attribute part. Is ex
>>> going to
>>> > be dynamic to set the attribute name correctly?
>>> >
>>> Take a look at the send method (or in the special case of active
>>> record you could use update_attributes (or write_attribute and []= if
>>> you want to operate a level lower))
>>>
>>> Fred
>>>
>>> >
>>> >
>>>
>>> > On Sun, Apr 4, 2010 at 12:23 PM, Conrad Taylor <[email protected]>
>>> wrote:
>>> > > On Sun, Apr 4, 2010 at 9:29 AM, Me <[email protected]> wrote:
>>> >
>>> > >> How would I take the dynamic nature of define_method and also use
>>> that
>>> > >> to set attributes:
>>> >
>>> > >> define_method ("#{ex}_method") do
>>> > >> self.my_db_attribute_ex = value
>>> > >> end
>>> >
>>> > >> Is there a way to set the attribute part dynamically?
>>> >
>>> > > Me, you would do something like the following:
>>> >
>>> > > define_method( "#{ex}_method" ) do |value|
>>> > > self.my_db_attribute_ex = value
>>> > > end
>>> >
>>> > > Good luck,
>>> >
>>> > > -Conrad
>>> >
>>> > >> --
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>>
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