gmane.comp.lang.ruby.rails

Erik Rantapaa | 20 Jul 02:42

looking up accessor methods for ActiveRecord objects


Hi,

I am trying to invoke a method on an ActiveRecord object using something
like:

k = :date=
obj.method(k).call(new_date)

Initially obj.method(k) is throwing a NameError. However, if I first
explicitly invoke _any_ accessor method, then the above works as
expected:

obj.date  # just get the date
k = :date=
obj.method(k).call(new_date) # works now

Is there a good way to ensure that these accessor methods are loaded
before
I try looking them up with .method()?

Thanks,
Erik
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David A. Black | 20 Jul 03:40

Re: looking up accessor methods for ActiveRecord objects


Hi --

On Sun, 20 Jul 2008, Erik Rantapaa wrote:

>
> Hi,
>
> I am trying to invoke a method on an ActiveRecord object using something
> like:
>
> k = :date=
> obj.method(k).call(new_date)
>
> Initially obj.method(k) is throwing a NameError. However, if I first
> explicitly invoke _any_ accessor method, then the above works as
> expected:
>
> obj.date  # just get the date
> k = :date=
> obj.method(k).call(new_date) # works now

Interestingly, that will happen when you call any unknown method on
the object:

>> t
=> #<Team id: 277401923, name: "Persuaders", mascot: "Cat", ... >
>> t.methods.grep(/mascot/)
=> []
>> t.blah

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Phlip | 20 Jul 03:02

Re: looking up accessor methods for ActiveRecord objects


> Is there a good way to ensure that these accessor methods are loaded
> before
> I try looking them up with .method()?

   obj.public_methods.include('k')

? (Also I can't remember if k must be a symbol - :k)

BTW I doubt your premise, because I thought all attribute accessors get 
generated at .find time...

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David A. Black | 20 Jul 03:42

Re: looking up accessor methods for ActiveRecord objects


Hi --

On Sat, 19 Jul 2008, Phlip wrote:

>
>> Is there a good way to ensure that these accessor methods are loaded
>> before
>> I try looking them up with .method()?
>
>   obj.public_methods.include('k')

The column attributes aren't there initially. (Try it; you'll see.)

> ? (Also I can't remember if k must be a symbol - :k)
>
> BTW I doubt your premise, because I thought all attribute accessors get
> generated at .find time...

No, find doesn't define the column attribute methods.

David

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