Hello Luigi Sison,

If it is normal xml view for form and tree than just put name of your field (many2one) of that model, if you have defined name field on that model than name value will be display. you cannot display other fields. If you want to display multiple field display for many2one than you need to override name_get() of that model.

and yes, if it is about q-Web report than you can follow the answer given by Jeff Beidler .

Hope this will help.

Regards,

Anil.

In every one2many relationship field there is a many2one field in the other side of the relation, so you should have in Model 2 a many2one field to Model 1. To display the name of Model 1 in a form view of Model 2 you need to declare the name as a related field in Model 2 class definition, something like this:

class model1(osv.osv):
    _name = 'model1'
    
    _columns = {
        'name': fields.char('Name', size=64, required=True),
        'model2_ids': fields.one2many('model2', 'model1_id', string='Models 2'),
    }
model1()

class model2(osv.osv):
    _name = 'model2'
    
    _columns = {
        'name': fields.char('Name', size=64, required=True),
        'model1_id': fields.many2one('model1', string='Model 1'),
        'name_rel': fields.related('model1_id', 'name', type='char', string='Model 1 Name')
    }
model2()    

Then in your view of Model 2 just add 

<field name="name_rel"/>

try to use this

from odoo import models, fields, api


class MyModel(models.Model):
    _name = "my.model"

    another_model_ids = fields.One2Many(
        comodel_name="another.model", inverse="my_model_id",
        string="Another Model Entries")


class AnotherModel(models.Model):
    _name = "another.model"

    my_model_id = fields.Many2One(
        comodel_name="my.model", string="My Model")
    number = fields.Integer(string="A Number")
    yet_another_model_id = fields.Many2One(
        comodel_name="yet.another.model", string="Yet Another Model")

    @api.multi
    def name_get(self):
        # with context flags you can implement multiple
        # possibilities of name generation
        # best example: res.partner
        res = []
        for another_model in self:
            res.append((another_model.id, "{} {}".format(
                another_model.number,
                another_model.yet_another_model_id.name)))
        return res


class YetAnotherModel(models.Model):
    _name = "yet.another.model"

    name = fields.Char(string="Name")

Try something like <span t-field="o.mod1_id.name">, where "mod1_id" is the name of your relation field to Model 1.