[tryton] Filling a selection field based on value of another instance field.

[Steven Lightfoot]

Hi

What is the easiest way of filling a selection field dynamically? I need to fill it based on a custom product class that has a description and up to 8 can sizes (different products will have different available can sizes)

Using a classmethod function does not give me the access to the instance values so I assume that a function field is the way to go but the only examples I can see using a function field is to set a value from a predefined list.

Should I be going down the route of using One2Many, Many2one fields?

No idea if this makes sense or not :-)

If not then I will go forth back to the shadows from whence I came!!!!

[Cédric Krier]

Post by Steven Lightfoot
What is the easiest way of filling a selection field dynamically? I need to fill it based on a custom product class that has a description and up to 8 can sizes (different products will have different available can sizes)
Using a classmethod function does not give me the access to the instance values

So use an instance method decorated with fields.depends:
http://doc.tryton.org/4.6/trytond/doc/ref/models/fields.html#trytond.model.fields.Selection.selection

Post by Steven Lightfoot
so I assume that a function field is the way to go but the only examples I can see using a function field is to set a value from a predefined list.

Function field works the same way as standard field.

Post by Steven Lightfoot
Should I be going down the route of using One2Many, Many2one fields?

It is also an option, it depends of the schema.


But did you considered to use the product_attribute ? It seems to be
exactly the solution to your "product class".

[Steven Lightfoot]

Thank you cedric, I had not considered the product_attribute. I will have another look.

Much appreciated.

Post by Steven Lightfoot
Hi
What is the easiest way of filling a selection field dynamically? I need to fill it based on a custom product class that has a description and up to 8 can sizes (different products will have different available can sizes)
Using a classmethod function does not give me the access to the instance values so I assume that a function field is the way to go but the only examples I can see using a function field is to set a value from a predefined list.
Should I be going down the route of using One2Many, Many2one fields?
No idea if this makes sense or not :-)
If not then I will go forth back to the shadows from whence I came!!!!