I have tree models (Model1, Model2, Model3), how can I show one field from Model2 or Model3 in Model1 with a TypeModel in Model1 and only an ID in Model2 or Model3?
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You have to connect the two models with one field over a many2one relation. Then you can automatically use any field of the connected model. As an example, check event.registration that contains the field event_id in a many2one relation with the precision that the model for event_id is event.event. This way, you can from within the event.registration access all fields of the corresponding event.
For more detail please check
https://www.odoo.com/documentation/15.0/developer/howtos/rdtraining/08_relations.html
Hope this helps.
