old_contents: # -*- coding: utf-8 -*-
  # Part of Odoo. See LICENSE file for full copyright and licensing details.
  
  from odoo import api, fields, models, _
  from odoo.exceptions import UserError
  
  
  class PlanActivityType(models.Model):
      _name = 'hr.plan.activity.type'
      _description = 'Plan activity type'
  
      activity_type_id = fields.Many2one(
          'mail.activity.type', 'Activity Type',
          default=lambda self: self.env.ref('mail.mail_activity_data_todo'),
          domain=lambda self: ['|', ('res_model_id', '=', False), ('res_model_id', '=', self.env['ir.model']._get('hr.employee').id)]
      )
      summary = fields.Char('Summary')
      responsible = fields.Selection([
          ('coach', 'Coach'),
          ('manager', 'Manager'),
          ('employee', 'Employee'),
          ('other', 'Other')], default='employee', string='Responsible')
      responsible_id = fields.Many2one('res.users', 'Responsible Person')
  
      @api.onchange('activity_type_id')
      def _onchange_activity_type_id(self):
          if self.activity_type_id and self.activity_type_id.summary and not self.summary:
              self.summary = self.activity_type_id.summary
  
      def get_responsible_id(self, employee_id):
          if self.responsible == 'coach':
              self.responsible_id = employee_id.coach_id.user_id
              if not self.responsible_id:
                  raise UserError(_('No user linked to the coach of %s. Please contact an administrator.') % employee_id.name)
          elif self.responsible == 'manager':
              self.responsible_id = employee_id.parent_id.user_id
              if not self.responsible_id:
                  raise UserError(_('No user linked to the manager of %s. Please contact an administrator.') % employee_id.name)
          elif self.responsible == 'employee':
              self.responsible_id = employee_id.user_id
              if not self.responsible_id:
                  raise UserError(_('No user linked to the employee %s. Please contact an administrator.') % employee_id.name)
          return self.responsible_id
  
  
  class Plan(models.Model):
      _name = 'hr.plan'
      _description = 'plan'
  
      name = fields.Char('Name', required=True)
      plan_activity_type_ids = fields.Many2many('hr.plan.activity.type', string='Activities')
      active = fields.Boolean(default=True)
  
new_contents: # -*- coding: utf-8 -*-
  # Part of Odoo. See LICENSE file for full copyright and licensing details.
  
  from odoo import api, fields, models, _
  from odoo.exceptions import UserError
  
  
  class HrPlanActivityType(models.Model):
      _name = 'hr.plan.activity.type'
      _description = 'Plan activity type'
      _rec_name = 'summary'
  
      activity_type_id = fields.Many2one(
          'mail.activity.type', 'Activity Type',
          default=lambda self: self.env.ref('mail.mail_activity_data_todo'),
          domain=lambda self: ['|', ('res_model_id', '=', False), ('res_model_id', '=', self.env['ir.model']._get('hr.employee').id)]
      )
      summary = fields.Char('Summary')
      responsible = fields.Selection([
          ('coach', 'Coach'),
          ('manager', 'Manager'),
          ('employee', 'Employee'),
          ('other', 'Other')], default='employee', string='Responsible', required=True)
      responsible_id = fields.Many2one('res.users', 'Responsible Person', help='Specific responsible of activity if not linked to the employee.')
  
      @api.onchange('activity_type_id')
      def _onchange_activity_type_id(self):
          if self.activity_type_id and self.activity_type_id.summary and not self.summary:
              self.summary = self.activity_type_id.summary
  
      def get_responsible_id(self, employee):
          if self.responsible == 'coach':
              if not employee.coach_id:
                  raise UserError(_('Coach of employee %s is not set.') % employee.name)
              responsible = employee.coach_id.user_id
              if not responsible:
                  raise UserError(_('User of coach of employee %s is not set.') % employee.name)
          elif self.responsible == 'manager':
              if not employee.parent_id:
                  raise UserError(_('Manager of employee %s is not set.') % employee.name)
              responsible = employee.parent_id.user_id
              if not responsible:
                  raise UserError(_('User of manager of employee %s is not set.') % employee.name)
          elif self.responsible == 'employee':
              responsible = employee.user_id
              if not responsible:
                  raise UserError(_('User linked to employee %s is required.') % employee.name)
          elif self.responsible == 'other':
              responsible = self.responsible_id
              if not responsible:
                  raise UserError(_('No specific user given on activity.') % employee.name)
          return responsible
  
  
  class HrPlan(models.Model):
      _name = 'hr.plan'
      _description = 'plan'
  
      name = fields.Char('Name', required=True)
      plan_activity_type_ids = fields.Many2many('hr.plan.activity.type', string='Activities')
      active = fields.Boolean(default=True)
  
subject: clean some bits of models in plan