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@api.model
def default_get(self, fields):
  res = super(PresentationWizard, self).default_get(fields)
  crm_lead_id = self.env.context.get('active_id')
  crm_lead = self.env['crm.lead'].browse(crm_lead_id)
  if 'attachment_doc' in fields:
    res.update({'attachment_doc': crm_lead.file_prospect})
    return res

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use attribute force_save="1" in view to save value of readonly field.

<field name="payment_type" readonly="1" force_save="1"/>

it will save value of payment_type field when onchange trigger.

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dict(self._fields['your_field'].selection).get(self.your_field)

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...

date_tz = fields.Selection('_tz_get', string='Timezone', required=True,
         	default=lambda self: self.env.user.tz or 'UTC')

@api.model
def _tz_get(self):
	return [(x, x) for x in pytz.all_timezones]

...

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SELECT table_name 
FROM information_schema.tables
WHERE table_schema = 'database_name'
ORDER BY table_name ASC;

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[('x_partners','=',parent.partner_id)]

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<field name="journal_ids" context="{'tree_view_ref':'module_name.my_joural_tree_view'}" />

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(0, 0,  { values })    link to a new record that needs to be created with the given values dictionary
(1, ID, { values })    update the linked record with id = ID (write *values* on it)
(2, ID)                remove and delete the linked record with id = ID (calls unlink on ID, that will delete the object completely, and the link to it as well)
(3, ID)                cut the link to the linked record with id = ID (delete the relationship between the two objects but does not delete the target object itself)
(4, ID)                link to existing record with id = ID (adds a relationship)
(4, [ID])                link to existing record with id = ID (adds a relationship)
(5)                    unlink all (like using (3,ID) for all linked records)
(6, 0, [IDs])          replace the list of linked IDs (like using (5) then (4,ID) for each ID in the list of IDs)
(5, 0, 0) unlink all

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Run from Terminal:

python3 odoo-bin shell -d mydb --addons-path=/your/addons/path

Run from python console:

self.env['ir.module.module'].search([('name', '=', 'crm')]).button_immediate_uninstall()

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class ModelA(models.Model):
  _name = "model.a"
  
  alias_contact = fields.Selection([
      ('everyone', 'Everyone'),
      ('partners', 'Authenticated Partners'),
      ('followers', 'Followers only')], default='everyone',
      string='Alias Contact Security', required=True,
      help="Policy to post a message on the document using the mailgateway.\n"
           "- everyone: everyone can post\n"