#datamapper on 2013-07-12 — irc logs at freenode.irclog.whitequark.org

2013-06-06 16:15 dkubb changed the topic of #datamapper to: Datamapper v1.2.0 | Mailing List: http://is.gd/aa9D | Logs: http://is.gd/qWAL7V | DataMapper 2 Renamed to ROM, see #rom-rb for development

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01:35 <xybre> What about practively selecting only the attributes you want?

01:37 <xybre> oh I'm lagged bad.

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17:09 <lnormous> Is there a way to get DataMapper to read my initialize method on .create as well as .new?

17:09 <mbj> lnormous: "read my initialize method", I dont get this. :D

17:11 <lnormous> So I have an initialize method that taken an argument, and if I do Object.new(), I get a 'wrong number of arguments 0 for 1' error

17:11 <lnormous> but if I do Object.create(), it works, and I would like it not to

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17:14 <mbj> lnormous: I think shou need to refactor your initialize method :d

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17:18 <lnormous> refactor how? I presume it's not being called, or it would throw an exception..

17:19 <mbj> lnormous: If you define a method that takes an arg and you want to be able to call it without an arg you need to change it.

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17:19 <mbj> There is nothing more to add here. This is a ruby issue not a datamapper issue.

17:20 <lnormous> I think you have misunderstood my question. I want the create method to call initialize, and currently it isn't

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17:20 <lnormous> The fact that .new fails without any arguments is the behaviour I want. The fact that create doesn't fail is the problem for me

17:21 <mbj> lnormous: okay, got it.

17:22 <mbj> lnormous: I dont know how dm1 internally implements .create

17:22 <mbj> Ideally you look into the source.

17:23 <lnormous> That's the next step, if no one here can help, yes...

17:23 <mbj> lnormous: I wasnt part of the team when dm1 was wrote, sorry.

17:24 <lnormous> No need to apologise! I'll just hang out here and see if anyone has any idea.

17:28 <mbj> lnormous: https://github.com/datamapper/dm-core/blob/master/lib/dm-core/model.rb#L461-L463

17:29 <mbj> this should explain it.

17:29 <mbj> It defaults to an empty attribute hash

17:29 <mbj> This will get passed into .new via _create.

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17:31 <lnormous> hmm, OK

17:31 <lnormous> so even if you have a default value like initialize(arg = "foo"), it will be ignored and an empty hash passed instead

17:32 <mbj> lnormous: Generally you should not override the initializer.

17:33 <lnormous> OK, maybe I'll try and do what I want with hooks instead

17:35 <mbj> lnormous: Why dont use a service object?

17:36 <lnormous> mbj: That sounds interesting, but I'm not sure what you mean :)

17:36 <mbj> lnormous: http://stackoverflow.com/questions/13294788/how-can-i-have-a-datamapper-callback-happen-in-a-transaction/13444988#13444988

17:36 <Cinchy> [URL] ruby - How can I have a DataMapper callback happen in a transaction? - Stack Overflow

17:37 <mbj> lnormous: Hooks are to "magic" :D

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17:38 <lnormous> mbj: Great, I'll give it a read through and see what's gonna work best for my situation. Thanks for all your help!

17:39 <mbj> lnormous: np, feel free to revisit this project later: http://rom-rb.org/

17:39 <mbj> We are building ROM, the successor of dm-1 currently.

18:12 <lnormous> haha, now I can't even get before :create to work

18:12 <lnormous> Seems like it just isn't my day

18:15 <mbj> lnormous: Forget hooks. Hooks are quasi untestable, IMHO.

18:15 <mbj> As a concept.

18:17 <lnormous> This is such a simple thing I want to do - generate a token using SecureRandom.hex whenever a model is created

18:17 <lnormous> just before :create do self.token = SecureRandom.hex(32) end

18:20 <lnormous> If you recommend not using a custom initializer and not using hooks, then I'm running out of options

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18:43 <mbj> lnormous: default

18:43 <mbj> property :foo, :default => proc { SecureRandom.hex }

18:43 <lnormous> ah, awesome

18:44 <mbj> lnormous: you should have told me about your case details eariler :D

18:45 <lnormous> It seems so

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22:56 <mbj> !memo dkubb Nope, never saw spoon before, lemme dig deeper tomorrow.

22:56 <Cinchy> mbj: Memo recorded for dkubb.

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