[IMP]backend link to attribute.attribute.

[Rona111]

creation shouldn't be linked to Magento attribute (magento.attribute) of a specific backend but should be linked to attribute.attribute.

[Rona111]

cc @elicoidal @seb-elico @duanyp1991 @siyuancn @liulixia1990

[seb-elico]

@Rona111 I didn't ask you to create a new field and keep the old one (and make it invisible...), you need to change the current field to link with another model (attribute.attribute instead of magento.product.attribute). If there is a technical limitation to do that (such as "when I change the type, the data becomes incorrect because the foreign keys are wrong"), then please explain it here.

[Rona111]

@seb-elico Usually,we can not modified the field directly, because the old fields foreigh key still exists,and if you update the old data directly,the database will raise an error that there is no that id, and when you save the new data,the database will raise a error that the foreign key is wrong.modified the id is not enouth.the relationship between is still exist.so it's not a good way to update the old one directly.add the new field and migrate the data based one the old one ,and recreate the relationship between the two models is more simple and stable.

[seb-elico]

@Rona111 clear, thanks. In that case, please:

• do not hide the old field, just leave it here so we can compare the 2 fields
• prepare a second PR (checkout a new branch from that one) to remove the old field

[Rona111]

cc @elicoidal @seb-elico @duanyp1991 @siyuancn @liulixia1990

[seb-elico]

@Rona111 Would it be possible to rename the old field to magento_attribute_id (same for the labels and so on) and call the new one attribute_id?

[Rona111]

@seb no,rename the old field will lost all the data.

[seb-elico]

@Rona111 Ok, so please rename the field attribute_attribute_id into attr_id

[Rona111]

cc @seb-elico