[LRUG] Looping through classes

[Ronny Ager-Wick]

Thanks, Jon,
this is practically what I asked for - a list of all of the objects I need, 
and a few more. For some reason I got an error on the last line. 
https://gist.github.com/JonRowe/5158141#comment-797997 Not to worry though, 
with all the information I got, I'm well on my way to a solution.
Ronny.


On 14/03/13 09:42, Jon Rowe wrote:
> You can get the constants of Object or some other top level object, map them 
> into the actual constants (cause Ruby returns them as symbols),and then 
> filter them...
>
> Something along the lines of this... https://gist.github.com/JonRowe/5158141
>
> Jon Rowe
> -----------------------------
> mail at jonrowe.co.uk
> jonrowe.co.uk
>
> On Thursday, 14 March 2013 at 11:38, Ronny Ager-Wick wrote:
>
>> I've been trying to find a way to do this, but I may be searching for the
>> wrong terms or something because I get nowhere, even with the help of my
>> friend Google.
>> I want to loop through the defined classes to see which ons of them responds
>> to certain methods.
>> The classes I'm trying to find are Ohm Models that have a certain attribute
>> defined.
>> If I had a collection of classes, I'd probably do something like this:
>>
>> classes = #get list of all classes
>> classes.each { |c|
>> # assume it's an Ohm::Model if it responds to :first
>> # maybe there's a better way of filtering out only the Ohm models
>> if c.respond_to?(:first) && c.first.respond_to?(:updated_at)
>> # convert the timestamp of all records in this model.
>> end
>> end
>>
>> The end objective is to convert the timestamp from the old way they used to
>> store it (Ohm-contrib 0.*) which looks like this "2011-02-25 21:54:06 UTC",
>> and the new way, which are UNIX timestamps.
>> I could always just make a list of the models manually and loop through them,
>> but I want to make a reusable script that others can benefit from as well.
>> Ronny.
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>

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