How to use Many2many field as a related field and use it to group by data in odoo tree view

Question

category_ids = fields.Many2many(related='employee_id.category_ids', string='Tags')

In XML tree view:

I have tried the above. it's working fine. I can filter the data using category_ids.
But I can't group by using category_ids! I have tried using store=True. but it gives me below error:
psycopg2.errors.UndefinedTable: relation "none" does not exist

Cybrosys Techno Solutions Pvt.Ltd · Answer

Hi,
You cannot group by many2many fields in Odoo. When you provide a
group by filter using a many2many field, You will get an error message
like Assertion error.To provide a group by filter using many2many fields
Try refer the blog:
https://www.cybrosys.com/blog/how-to-use-group-by-for-many2many-fields-in-odoo-16 [1]

Hope it helps.

[1] https://www.cybrosys.com/blog/how-to-use-group-by-for-many2many-fields-in-odoo-16

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