I'm trying to model a One2One and a one2many relationship for two tables,
they have self reference.
The tables are like this
part(pk_id, name) , assembly(fk_part_id, fk_part_id_component,
comp_quantity)
I have two classes part.py and assembly.py, they inherit from ModelSQL and
ModelView
Part():
pid = 'Integer field'
name = 'string' Field
Assembly():
part_id= fields.One2One( 'inventory.part', 'pid', 'part_id',
'part_number')
comp_id = fields.One2Many(inventory.part', 'pid', 'comp_id',
'comp_id')
I read the docs
[One2One](http://doc.tryton.org/2.4/trytond/doc/ref/models/fields.html#one2one)
and
[One2Many](http://doc.tryton.org/2.4/trytond/doc/ref/models/fields.html#one2many),
yet I don't fully
understand the concept of 'origin, 'target', also whats the difference
between 'relation_name' and 'model_name'
I run
$ trytond -u all -d mydb
And get this error:
AssertionError: add_remove must be a list
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