Relational Fields provide the option to link the data of one model with the data of another model.
In Odoo, relational field types are One2many, Many2one, Many2many.
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An One2many field is a one-way direction of selecting multiple records from a table.
For example, a Sales Order can contain multiple Sales Order Lines, which also contain multiple fields of information.
A Many2one field is a one-way direction of selecting one record from a table.
For example, you can have many product categories, but each product can only belong to one category.
A Many2many field is a two-way direction of selecting records from a table.
For example, multiple tags can be added to a lead’s form.
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