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ai

I have 3 classes:

class Parent(models.Model):

    _name='parent.parent'


class Child1(models.Model):

    _name="child.child1"

    _inherits={'parents.parents': 'parent_id'}

    parent_id = fields.Many2one('parent.parent', required=True, ondelete="cascade")

class Child2(models.Model):

    _name="child.child2"

    _inherits={'parents.parents': 'parent_id'}

    parent_id = fields.Many2one('parent.parent', required=True, ondelete="cascade")

How can I navigate from parent.parent to his (all) children? Do I need to declare to new fields in the parent like ?:

child1 = fields.Many2one('child.child1', store=False)

child2 = fields.Many2one('child.child2', store=False)

Is there a better solution?




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Adrien

'store' is used for computed fields which are by default not stored in database, so you can add store=True to store it.

In your example, the use of store=False is irrelevant.

Also, it seems you need to understand better the inheritance concept and relational field concept. See my answer below.

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Adrien
Best Answer

Hi,

1. About Model inheritance

First of all, are you sure you really need "_inherits" ?
It is much more common to use "inherit" which works like this :
_name = 'child1.child1'
_inherit = ['parent.parent']
And then you can use the field of the parent in the child object :
child1.parent_field

If you don't know the difference, see e.g. :

https://www.odoo.com/fr_FR/forum/how-to/developers-13/the-different-openerp-model-inheritance-mechanisms-what-s-the-difference-between-them-and-when-should-they-be-used-46


2. About parent / child relation :

This is not related with inheritance but to relational fields.

In that case you can have :

- a One2many field in the parent model to its children

example : child1_ids = fields.One2many(comodel_name='child1.child1', inverse_name='parent_id')

then you can do:

for child1 in parent.child1_ids:

    ... do smth ...

- a Many2one field in the child object to its parent (that must then be called 'parent_id' to correspond to the 'inverse_name' used before)

see for example the link between a partner and its contacts in native Odoo.

And explanation of relational fields :

https://www.odoo.com/fr_FR/forum/aide-1/question/relational-fields-114056

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ai
Author

Thanks, Yes I think I need inherits. Because I have many classes which use the parent.parent. If I use One2many and Many2one, I need to declare many of them in parent.parent. I want to access some attributes of the child1, child2, childn from parent.parent.

Maybe, I want to display/choose children with fields.Many2one(parent.parent) in a view.

Is this possible?

Adrien

It is not clear what you mean and need.

Can you clarify what you need :

- parent/child relation between RECORDS ? ===> This is handled with relational fields

- or parent/child relation between MODELS ==> This is handled with inheritance

Maybe you could provide a minimal practical example of what you want to do?

ai
Author

class Selector(models.Model):

_name = 'selector.model'

selectOne = fields.Many2one('parent.parent')

fieldOfChildren1 = fields.Char(related='selectOne.attributeOfChildren1')

fieldOfChildren2 = fields.Integer(related='selectOne.attributeOfChildren2')

Is this somehow possible?

I think it is relation between MODELS.

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