Many-to-many relation filter

Question

I need to filter my query with categories table which has many2many relation with another table. Is it possible to filter query with many2many relation?

Table

Answer 1

As you already noticed, the many2one category_id is not represented in the database as a table field, but as a table relating Partners and Categories.

The SQL you need could look like this:

SELECT p.* 
FROM res_partner p
  INNER JOIN res_partner_category_rel rel ON p.id = rel.partner_id
    INNER JOIN res_partner_category c ON rel.category_id = c.id
WHERE c.id in (3,4)

If you want to do the filter in the python object, the usual searchcall should work:

list_ids = partner_model.search(cr, uid, [('category_id', 'in', [3,4])])

As a bonus, since Categories are organized in a tree, you could get those categories and all their children using:

list_ids = partner_model.search(cr, uid, [('category_id', 'child of', [3,4])])