Rémy Voet (ryv)
65a2c2ebc8
In e0297bdac4, the creation of a new
record always patches the inverse fields of relational fields in order
to make the cache of those inverse fields consistent.
For instance, when creating a new record like
user = model.new({'group_ids': [Command.link(group.id)]})
The inverse of field 'group_ids' on the new record having 'group' as
origin is patched so that its value includes record. A side effect of
this mechanism is that it fetches group.user_ids in order to patch the
value of new_group.user_ids, where 'new_group' is the new record having
'group' as origin.
The side effect described above is problematic when that inverse field
has huge cardinality, like hundreds of thousands of records, and this
performance overhead is unacceptable when the inverse field is actually
not used at all.
We address this performance issue by patching the value of x2many fields
only when they are used. If the value of the field is not in cache yet,
the patch is applied once a value is put in cache. If the field is not
used, the patch is simply never applied.
Part-of: odoo/odoo#149624
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