Multi Steps Wizards

This module is a base for creating multi-steps wizards. It does nothing by itself.

Example of class:

class MyWizard(models.TransientModel):
    _name = 'my.wizard'
    _inherit = ['multi.step.wizard.mixin']

    project_id = fields.Many2one(
        comodel_name='project.project',
        name="Project",
        required=True,
        ondelete='cascade',
        default=lambda self: self._default_project_id(),
    )
    name = fields.Char()
    field1 = fields.Char()
    field2 = fields.Char()
    field3 = fields.Char()

    @api.model
    def _selection_state(self):
        return [
            ('start', 'Start'),
            ('configure', 'Configure'),
            ('custom', 'Customize'),
            ('final', 'Final'),
        ]

    @api.model
    def _default_project_id(self):
        return self.env.context.get('active_id')

    def state_exit_start(self):
        self.state = 'configure'

    def state_exit_configure(self):
        self.state = 'custom'

    def state_exit_custom(self):
        self.state = 'final'

Example of view (note the mode, must be primary):

<?xml version="1.0" encoding="utf-8"?>
<odoo>

  <record id="my_wizard_form" model="ir.ui.view">
    <field name="name">my.wizard.form</field>
    <field name="model">my.wizard</field>
    <field name="mode">primary</field>
    <field name="inherit_id" ref="multi_step_wizard.multi_step_wizard_form"/>
    <field name="arch" type="xml">
      <xpath expr="//footer" position="before">
        <h1>
          <field name="name"
                attrs="{'readonly': [('state', '!=', 'start')]}"
                class="oe_inline"
                placeholder="Name"/>
        </h1>
        <group name="configure" attrs="{'invisible': [('state', '!=', 'configure')]}">
          <group>
            <field name="field1"/>
            <field name="field2"/>
          </group>
        </group>
        <group name="custom" attrs="{'invisible': [('state', '!=', 'custom')]}">
          <group>
            <field name="field3"/>
          </group>
        </group>
        <div name="final" attrs="{'invisible': [('state', '!=', 'final')]}">
          <p>The project is now configured.</p>
        </div>
      </xpath>
    </field>
  </record>

  <act_window id="open_my_wizard"
              name="My Wizard"
              res_model="my.wizard"
              src_model="project.project"
              view_mode="form" target="new" view_type="form" />
</odoo>