I can show a many2many relation in a tree view with the many2many_tags widget.
I can show a many2one relation in a tree view with the many2one_tags widget.
I cannot show a one2many relation in a tree view with a one2many_tags widget as that doesn't seem to exist.
I CAN use an inline definition for the tree view which will show me a count: 1 dataset, 2 datasets etc.
How does Odoo intend to display a one2many relation in a tree view?
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OK, thanks! I didn't immediately realize that the many2many_tags widget works also in the one2many case. So now I'm content with using that one.
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There is an OCA add-on for Odoo 8: https://apps.odoo.com/apps/modules/8.0/web_widget_one2many_tags/ and a paid one for v12: https://apps.odoo.com/apps/modules/12.0/oi_one2manytags/
Thank you, I'll give the free one a try! Is there a reason why this is not part of the platform? It seems basic to me.
Sorry, I don't know why! But I think you can use many2many instead if you really need the tags, maybe that's good enough in most cases.