In Odoo, we can connect an object of a model with another object of a comodel. Many2one relational field is used to provide a link to a co-model in Odoo. We can access the records, by calling the many2one field.

1. Many2One Fields in
Odoo 16

2. In Odoo, we can connect an object of a model with
another object of a comodel. Many2one relational field
is used to provide a link to a co-model in Odoo. We can
access the records, by calling the many2one field.

3. Before explaining a Many2One field we need to know that what is a relational fields ,
A Relational fields in Odoo are used to link one model with another. Relational fields are important because it is a
very common need that we have to create relational links between different models, for developing and
implementing our business as per the needs in Odoo.
For example, in the model of Sales Order, we need to have fields that are related to the model of Products,
Contacts, Salesman, Company, and many more.
In Odoo there are three types of relational fields that are,
1- Many2One
2- Many2Many
3- One2Many

4. Let’s discuss about what is a Many2One field and how it create,
A Many2one field relates the current model's record with one among the many records of the
second model, called the co-model. By convention, many2one fields have the _id suffix.
You can define a Many2one field in your model as:
The value of such a field will be a record set of size 0 (no record) or 1 (a single record). If we
check the database table of the model, the column corresponding to the Many2one field will
be of the type integer and will contain an integer value, which is the id of the record of the co-
model.

5. Let’ see an example from the UI,

6. In the above picture we can see a list of records is displayed
like a selection fields, but we can only choose one record, that
is the purpose of the Many2One field.

7. Let’s discuss how it create in Odoo,
The image above illustrates that we define a Many2One field with the comodel_name
‘res.partner’ that means the contact we can get the partners.

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