| chat.freenode.net #tryton log beginning Wed Feb 19 00:00:01 CET 2014 | ||
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| 2014-02-19 09:23 <jvblasco> morning everyone | ||
| 2014-02-19 09:29 <defyasdf> morning | ||
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| 2014-02-19 09:55 <corro> Is anyone experienced in stock management in Tryton? What's the intended strategy for assigning goods to outgoing shipments once they are purchased? | ||
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| 2014-02-19 13:47 <jvblasco> can anyone point me some code making use of function fields? Not the field definition, the usage of the field. | ||
| 2014-02-19 13:48 <jvblasco> i'm trying to understand how do function fields exactly work, they seem powerfull but i cannot figure out how to use them just from the API documentation. | ||
| 2014-02-19 13:49 <meanmicio> jvblasco : check the patient age in GNU Health | ||
| 2014-02-19 13:54 <jvblasco> meanmicio: where i find the code? i mean, do u have any public repo i can check? | ||
| 2014-02-19 13:54 <jvblasco> where can i* | ||
| 2014-02-19 13:55 <jeancavallo> jvblasco: Have a look here : http://hg.tryton.org/modules/account/file/a1176be9fa2d/party.py#l57 | ||
| 2014-02-19 13:55 <meanmicio> jvblasco : http://health.gnu.org or the mercurial repo http://hg.savannah.gnu.org/hgweb/health/ | ||
| 2014-02-19 13:56 <jeancavallo> jvblasco: Function fields are useful to display / search calculated data based on the stored columns of the model | ||
| 2014-02-19 13:56 <jeancavallo> jvblasco: To use them in your code, they are supposed to behave as normal fields, except for the fact that they cannot be set (unless you define the setter function) | ||
| 2014-02-19 13:57 <jvblasco> jeancavallo: but can i use them like normal fields. eg: Party.my_function_field? | ||
| 2014-02-19 13:57 <jeancavallo> jvblasco: yes | ||
| 2014-02-19 13:57 <jvblasco> jeancavallo: and display them in views without problems? | ||
| 2014-02-19 13:57 <jeancavallo> jvblasco: A few limitations : no setting (unless explicitely allowed in the field definition), not calculated while the record is not saved | ||
| 2014-02-19 13:59 <jeancavallo> jvblasco: As I said, if you display the view on an already existing record, no problem | ||
| 2014-02-19 14:00 <jeancavallo> jvblasco: If you want your function field to be calculated even though the record is not yet saved, the best approach is to use an on_change_with on your field, and use it as the getter of the function field. | ||
| 2014-02-19 14:00 <jvblasco> jeancavallo: ic | ||
| 2014-02-19 14:01 <jvblasco> jeancavallo: and do i need to implement the getter to be able to use it like a normal field? | ||
| 2014-02-19 14:01 <jeancavallo> jvblasco: Function fields are very powerful, but there are some tricks to know :) | ||
| 2014-02-19 14:01 <jeancavallo> jvblasco: Well, if you don't tryton will have no way to know what is the value of your field | ||
| 2014-02-19 14:02 <jeancavallo> jvblasco: And I think the getter is mandatory ;) | ||
| 2014-02-19 14:02 <jeancavallo> jvblasco: The setter / searcher are not though | ||
| 2014-02-19 14:02 <jvblasco> jeancavallo: i will need to experiment with that | ||
| 2014-02-19 14:03 <jeancavallo> jvblasco: Good luck | ||
| 2014-02-19 14:03 <jvblasco> jeancavallo: it REALLY looks powerfull | ||
| 2014-02-19 14:03 <jeancavallo> jvblasco: The link I sent you is some of the best use you can have | ||
| 2014-02-19 14:03 <jeancavallo> jvblasco: The getter is a classmethod (it can be an instance method as well), so the computation is done at the database level for lists of records | ||
| 2014-02-19 14:04 <jeancavallo> jvblasco: It is a little complex though. | ||
| 2014-02-19 14:05 <jeancavallo> jvblasco: Another example is "rec_name". When you override get_rec_name, you override the getter of the function field "rec_name" (sort of) | ||
| 2014-02-19 14:05 <jvblasco> jeancavallo: i already realized about complexity | ||
| 2014-02-19 14:06 <jvblasco> jeancavallo: so, to check my understanding, in the link with the def get_receivable_payable(cls, parties, names): i guess parties are party instances, and names are the name of the fields u want to use? | ||
| 2014-02-19 14:06 <jvblasco> jeancavallo: i don't really understand the method signature | ||
| 2014-02-19 14:08 <jeancavallo> jvblasco: That's it | ||
| 2014-02-19 14:08 <jeancavallo> jvblasco: You can use the same method as a getter for multiple fields (hence the "name" parameter | ||
| 2014-02-19 14:10 <jvblasco> jeancavallo: i will try to implement one for a use case i have around the code, i hope to be able to with that explanation | ||
| 2014-02-19 14:10 <jvblasco> jeancavallo: i think i understand them a little better now ;) | ||
| 2014-02-19 14:10 <jvblasco> jeancavallo: thnx so much for all the help | ||
| 2014-02-19 14:13 <jeancavallo> jvblasco: np | ||
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| 2014-02-19 15:57 <jvblasco> jeancavallo: u said that usually function fields are implemented as classmethods, but that sometimes can be implemented as instance methods, how do i know which one is the best way for a precise impelmentation? | ||
| 2014-02-19 15:58 <jeancavallo> jvblasco: It is the opposite | ||
| 2014-02-19 15:58 <jeancavallo> jvblasco: Usually they are implemented as instance method | ||
| 2014-02-19 15:59 <jvblasco> jeancavallo: i c, and how do i know when a classmethod is more convenient? | ||
| 2014-02-19 15:59 <jeancavallo> jvblasco: The use of classmethod is for when the computation is rather db intensive (aggregates...), so it is more efficient to to it by groups | ||
| 2014-02-19 15:59 <jvblasco> jeancavallo: i c, 1000 thnx ;) | ||
| 2014-02-19 16:00 <jeancavallo> jvblasco: The example I sent earlier is db intensive, so it is a classmethod | ||
| 2014-02-19 16:00 <jeancavallo> jvblasco: Bottom line is : classmethod when you have performance issues can help | ||
| 2014-02-19 16:01 <jvblasco> jeancavallo: ok, not my case right now, i hope ;) | ||
| 2014-02-19 16:01 <corro> jvblasco: also getter instance methods can often also be used as on_change method at the same time. this can be an advantage (less duplication). | ||
| 2014-02-19 16:02 <jvblasco> corro, jeancavallo: that could be usefull for realtime view value rendering, as jean was sugesting b4? | ||
| 2014-02-19 16:02 <jeancavallo> jvblasco: yeah | ||
| 2014-02-19 16:03 <jvblasco> jeancavallo, corro: i c | ||
| 2014-02-19 16:03 <jeancavallo> jvblasco: my_field = fields.Function(fields.Char('Party Name', on_change_with=['party']), 'on_change_with_my_field') | ||
| 2014-02-19 16:03 <jvblasco> omg | ||
| 2014-02-19 16:03 <jeancavallo> jvblasco: Just do not forget to add a name=None parameter in the on_change_with_my_field definition so it is both callable as a on_change_with and as a function field getter | ||
| 2014-02-19 16:04 <jvblasco> jeancavallo: i c | ||
| 2014-02-19 16:05 <jvblasco> btw the getter signature is getter(self, models, names), in case of instance methods what will i receive to models when i try to use the fields as a regular field? | ||
| 2014-02-19 16:05 <jvblasco> and do i receive instances, or just the class? | ||
| 2014-02-19 16:05 <jvblasco> sry about this but those fields, as powerfull as they are, they are rather complex too | ||
| 2014-02-19 16:07 <jvblasco> in the example i see it receives parties, but i can't figure out how those parties list is generated | ||
| 2014-02-19 16:09 <jeancavallo> jvblasco: It is automatic. You should never have to call the getter manually | ||
| 2014-02-19 16:10 <jeancavallo> jvblasco: and the signature for instance methods is : def my_getter(self, name) where name will be the field calling the getter | ||
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| 2014-02-19 16:13 <jvblasco> so no models in the call? | ||
| 2014-02-19 16:16 <jvblasco> i guess it's because the example b4 is a classmethod and not an instance one | ||
| 2014-02-19 16:16 <jvblasco> could it be? | ||
| 2014-02-19 16:16 <jeancavallo> jvblasco: If you mean the party.receivable / payable, yes | ||
| 2014-02-19 16:34 <jvblasco> and what do i need to return in the getter function? i mean the structure. In my case i'm making a Function field for a boolean field | ||
| 2014-02-19 16:35 <cedk> jvblasco: http://doc.tryton.org/3.0/trytond/doc/ref/models/fields.html?highlight=function#trytond.model.fields.Function.getter | ||
| 2014-02-19 16:36 <jvblasco> cedk: but i don't know from those docs the structure of the value i need to return | ||
| 2014-02-19 16:36 <jvblasco> cedk: if i return a boolean and exception is rised | ||
| 2014-02-19 16:37 <jvblasco> cedk: TypeError: 'bool' object has no attribute '__getitem__' | ||
| 2014-02-19 16:37 <jeancavallo> jvblasco: What is the exception ? You should return the type corresponding to the main field (integers for M2O !) | ||
| 2014-02-19 16:37 <cedk> jvblasco: the doc is pretty clear about the return | ||
| 2014-02-19 16:38 <jeancavallo> jvblasco: It means you are using a classmethod, so it's expected to return a dict matching ids and values | ||
| 2014-02-19 16:38 <cedk> jvblasco: but of course it is abvious that the value is the value | ||
| 2014-02-19 16:40 <jvblasco> cedk, jeancavallo: so in a definition: fields.Function(fields.Boolean('Blackout') the getter i guess must return a boolean, doesn't it? | ||
| 2014-02-19 16:42 <jvblasco> i'm implementing the getter as an instance method with def get_blackout(self, names): signature | ||
| 2014-02-19 16:42 <cedk> jvblasco: names -> name | ||
| 2014-02-19 16:45 <jvblasco> jeancavallo, cedk: that was the issue, thnx so much both of you for the help | ||
| 2014-02-19 16:53 <jvblasco> cedk: btw, u were right, in the documentation is clear the return value | ||
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| 2014-02-19 18:59 <jvblasco> i'm trying to figure out what tuples does the searcher need to return, but i cannot seem to | ||
| 2014-02-19 19:00 <jvblasco> i created a model Website with a m2o relation to a party, the party has a o2m relation to the website model | ||
| 2014-02-19 19:00 <jvblasco> the website model has a blackout boolean field | ||
| 2014-02-19 19:00 <jvblasco> the party has a Function field that checks if any of his websites is in blackout | ||
| 2014-02-19 19:01 <jvblasco> if any one of those is, then the field sets to True | ||
| 2014-02-19 19:01 <jvblasco> if not to false | ||
| 2014-02-19 19:01 <jvblasco> but i want to search if a party has a blackout | ||
| 2014-02-19 19:01 <jvblasco> using the function field, what means a searcher needs to be implemented | ||
| 2014-02-19 19:02 <jvblasco> but i can't figure out the list of tuples the searcher needs to return | ||
| 2014-02-19 19:03 <jvblasco> for example: Party.search([('blackout', '=', True)]) | ||
| 2014-02-19 19:03 <jvblasco> what will the tupple the searcher returns contain? | ||
| 2014-02-19 19:05 <jvblasco> [('party.id', '=', party.id)]? | ||
| 2014-02-19 19:05 <jvblasco> for parties that have a web with blackout = True? | ||
| 2014-02-19 19:05 <jvblasco> i don't really get what is done with that list of tuples, or what it is for | ||
| 2014-02-19 19:07 <jvblasco> sry for the text wall | ||
| 2014-02-19 19:08 <cedk> jvblasco: http://doc.tryton.org/3.0/trytond/doc/ref/models/fields.html?highlight=function#trytond.model.fields.Function.searcher | ||
| 2014-02-19 19:09 <jvblasco> but i don't understand what does the domain it returns contain | ||
| 2014-02-19 19:10 <cedk> jvblasco: read the domain doc | ||
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| 2014-02-19 20:28 <chitrank> Hello Tryton developers | ||
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