| chat.freenode.net #tryton log beginning Mon Jul 19 00:00:02 CEST 2010 | ||
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| 2010-07-19 16:50 <pheller> Hi Cedric | ||
| 2010-07-19 16:50 <cedk> pheller: hi | ||
| 2010-07-19 16:51 <pheller> So, I've been thinking through this concept of Product Attributes, and then Product Instances, which have Values for these Attributes | ||
| 2010-07-19 16:52 <pheller> The one thing I'm having a hard time figuring out is how to model the "Value". | ||
| 2010-07-19 16:52 <pheller> For example, I extend product.product to have a one2many (or many2many) with a new model "Attribute" | ||
| 2010-07-19 16:52 <pheller> there is a model "Instance", which has a many2one with product, and a one2many with a new model "Value" | ||
| 2010-07-19 16:52 <cedk> pheller: that's ok for me | ||
| 2010-07-19 16:54 <pheller> The Attribute model has various fields to identify the type of attribute (i.e., a "Char", or a "Text", or a "one2many" with some other model, a domain definition, etc) | ||
| 2010-07-19 16:54 <pheller> But, since this attribute can be many different things, I'm not sure how exactly to refer to it within the "Value" model. | ||
| 2010-07-19 16:56 <cedk> ok I see the issue | ||
| 2010-07-19 16:57 <pheller> I suppose the Value model's "value" field could be a fields.text, and then at runtime, depending on the Attribute type, the contents of this "value" could be cast as an integer when necessary (for relation types, etc) | ||
| 2010-07-19 16:57 <cedk> perhaps you should make different kind of attributes | ||
| 2010-07-19 16:58 <cedk> that will contain more business logic | ||
| 2010-07-19 16:59 <pheller> Here is my concept code (please understand that I have on typed this out to wrap my head around it, I don't expect this to run as is) | ||
| 2010-07-19 16:59 <pheller> http://pastebin.com/TNm6tUc6 | ||
| 2010-07-19 17:00 <pheller> I will be back after a 15-20 minute meeting. | ||
| 2010-07-19 17:02 <cedk> pheller: I think this is good but only for char value, other kind should be fields added to instance model (with the possibility to hide it depending of the product) | ||
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| 2010-07-19 17:58 <pheller> ok, I am back. the meeting went too long! | ||
| 2010-07-19 17:59 <pheller> So Cedric, are you suggesting I create models like: Attribute_Char, Value_Char, Attribute_One2Many, Value_One2Many, etc? And then on the product, have an "Attributes" notebook page which would have a one2many for each of these Attribute types? | ||
| 2010-07-19 18:02 <cedk> pheller: no | ||
| 2010-07-19 18:03 <cedk> pheller: just have this design for char attributes | ||
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| 2010-07-19 18:03 <cedk> pheller: and add directly fields on instance for other kinds | ||
| 2010-07-19 18:05 <pheller> Ah, I see. The problem with that is enforcing data integrity. I would implement Tryton so that only a few people can create and edit products, but many people could create or modify instances. | ||
| 2010-07-19 18:05 <pheller> The easiest way to ensure each Instance has every required attribute for its related Product is if I can define all of the attributes on the Product itself.... | ||
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| 2010-07-19 18:19 <cedk> pheller: yes then you can add a constraint on instance that validate all attributes have a value | ||
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| 2010-07-19 20:45 <cedk> dba: I have released relatorio | ||
| 2010-07-19 21:05 <dba> cedk: great, thank you | ||
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