[13.0][FIX] fix migration with product with twice the same attribute

[sebastienbeau]

Description of the issue/feature this PR addresses:

For some product you can have twice the same attribute
Example you have a bi-color product you can set
attribute line 1: color => white, black, yellow
attribute line 2: color => green, blue, yellow
if both attribute line have same value for the color it's a litle more
complexe to fill the value as you have two product_template_attribute_value
with the same attribute_value "yellow"

Current behavior before PR:

Migration fail

Desired behavior after PR is merged:

Migration work

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[kos94ok-3D]

Hi, @sebastienbeau.
It`s not allowed in Odoo 11, so maybe do it there?

[pedrobaeza]

Yeah, that my same question: how do you get to that incorrect configuration?

[sebastienbeau]

In my case, the data was coming from version 8, so it was possible in V8.
And in V13/V14 it's possible to do it.

[MiquelRForgeFlow]

If two product variants have the same attributes, then we should merge those variants into one record.

[MiquelRForgeFlow]

As I commented before about merging variants, I have done a PR with that approach, which I think is better. Please, could you check #2513?

[kos94ok-3D]

HI, @sebastienbeau. Could you confirm that #2513 fixed or not your problem?

[kos94ok-3D]

@sebastienbeau Any news?

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