How to change behavior of Odoo record's "Save" button?

Question

I am trying to add some custom code to the save function. When I click the save button, which JS file will make the Ajax call and which Python file will handle the call?

EDIT:

As requested in the comments, here is my note.py. How do I change the create function? Thanks

# -*- coding: utf-8 -*-
# Part of Odoo. See LICENSE file for full copyright and licensing details.

from odoo import api, fields, models, _
from odoo.tools import html2plaintext


class Stage(models.Model):

    _name = "note.stage"
    _description = "Note Stage"
    _order = 'sequence'

    name = fields.Char('Stage Name', translate=True, required=True)
    sequence = fields.Integer(help="Used to order the note stages", default=1)
    user_id = fields.Many2one('res.users', string='Owner', required=True, ondelete='cascade', default=lambda self: self.env.uid, help="Owner of the note stage")
    fold = fields.Boolean('Folded by Default')


class Tag(models.Model):

    _name = "note.tag"
    _description = "Note Tag"

    name = fields.Char('Tag Name', required=True, translate=True)
    color = fields.Integer('Color Index')

    _sql_constraints = [
        ('name_uniq', 'unique (name)', "Tag name already exists !"),
    ]


class Note(models.Model):

    _name = 'note.note'
    _inherit = ['mail.thread', 'mail.activity.mixin']
    _description = "Note"
    _order = 'sequence'

    def _get_default_stage_id(self):
        return self.env['note.stage'].search([('user_id', '=', self.env.uid)], limit=1)

    name = fields.Text(compute='_compute_name', string='Note Summary', store=True)
    user_id = fields.Many2one('res.users', string='Owner', default=lambda self: self.env.uid)
    memo = fields.Html('Note Content')
    sequence = fields.Integer('Sequence')
    stage_id = fields.Many2one('note.stage', compute='_compute_stage_id',
        inverse='_inverse_stage_id', string='Stage')
    stage_ids = fields.Many2many('note.stage', 'note_stage_rel', 'note_id', 'stage_id',
        string='Stages of Users',  default=_get_default_stage_id)
    open = fields.Boolean(string='Active', default=True)
    date_done = fields.Date('Date done')
    color = fields.Integer(string='Color Index')
    tag_ids = fields.Many2many('note.tag', 'note_tags_rel', 'note_id', 'tag_id', string='Tags')

    @api.depends('memo')
    def _compute_name(self):
        """ Read the first line of the memo to determine the note name """
        for note in self:
            text = html2plaintext(note.memo) if note.memo else ''
            note.name = text.strip().replace('*', '').split("\n")[0]

    @api.multi
    def _compute_stage_id(self):
        for note in self:
            for stage in note.stage_ids.filtered(lambda stage: stage.user_id == self.env.user):
                note.stage_id = stage

    @api.multi
    def _inverse_stage_id(self):
        for note in self.filtered('stage_id'):
            note.stage_ids = note.stage_id + note.stage_ids.filtered(lambda stage: stage.user_id != self.env.user)

    @api.model
    def name_create(self, name):
        return self.create({'memo': name}).name_get()[0]

    @api.model
    def read_group(self, domain, fields, groupby, offset=0, limit=None, orderby=False, lazy=True):
        if groupby and groupby[0] == "stage_id":
            stages = self.env['note.stage'].search([('user_id', '=', self.env.uid)])
            if stages:  # if the user has some stages
                result = [{  # notes by stage for stages user
                    '__context': {'group_by': groupby[1:]},
                    '__domain': domain + [('stage_ids.id', '=', stage.id)],
                    'stage_id': (stage.id, stage.name),
                    'stage_id_count': self.search_count(domain + [('stage_ids', '=', stage.id)]),
                    '__fold': stage.fold,
                } for stage in stages]

                # note without user's stage
                nb_notes_ws = self.search_count(domain + [('stage_ids', 'not in', stages.ids)])
                if nb_notes_ws:
                    # add note to the first column if it's the first stage
                    dom_not_in = ('stage_ids', 'not in', stages.ids)
                    if result and result[0]['stage_id'][0] == stages[0].id:
                        dom_in = result[0]['__domain'].pop()
                        result[0]['__domain'] = domain + ['|', dom_in, dom_not_in]
                        result[0]['stage_id_count'] += nb_notes_ws
                    else:
                        # add the first stage column
                        result = [{
                            '__context': {'group_by': groupby[1:]},
                            '__domain': domain + [dom_not_in],
                            'stage_id': (stages[0].id, stages[0].name),
                            'stage_id_count': nb_notes_ws,
                            '__fold': stages[0].name,
                        }] + result
            else:  # if stage_ids is empty, get note without user's stage
                nb_notes_ws = self.search_count(domain)
                if nb_notes_ws:
                    result = [{  # notes for unknown stage
                        '__context': {'group_by': groupby[1:]},
                        '__domain': domain,
                        'stage_id': False,
                        'stage_id_count': nb_notes_ws
                    }]
                else:
                    result = []
            return result
        return super(Note, self).read_group(domain, fields, groupby, offset=offset, limit=limit, orderby=orderby, lazy=lazy)

    @api.multi
    def action_close(self):
        return self.write({'open': False, 'date_done': fields.date.today()})

    @api.multi
    def action_open(self):
        return self.write({'open': True})

Answer 1

The create and write methods are included in every Odoo model because they are common methods defined in the Odoo BaseModel class.

That means that you can inherit or redefine those methods in any Odoo class.

from odoo import api, models


class Note(models.Model):
    # You don't need to redefine the whole model - just inherit it.
    _inherit = 'note.note'

    @api.model
    def create(self, vals):
        """
        Fires when the "Save" button is clicked after the "Create"
        button in order to create a new record.

        :param vals {dict}:
            Dictionary of values used to create the new record.
        :returns {odoo.models.Model}:
            The newly created `note.note` record.
        """
        res = super(Note, self).create(vals)
        # Do whatever you need to do here
        # `res` is the record that was created
        return res

    @api.multi
    def write(self, vals):
        """
        Fires when the "Save" button is clicked after the "Edit"
        button in order to update an existing record.

        :param vals {dict}:
            Dictionary of values used to update the records in self.
        :returns {bool}:
            True, as per super.
        """
        res = super(Note, self).write(vals)
        # Do whatever you need to do here
        # `self` is the record (or records) being updated
        # for record in self:
        #     record.do_something()
        return res