The states of a model for the Workflows in Odoo - odoo-10

Question

I am trying to implement Odoo publishing workflows for my custom model 'product_images.product_image'.
My models look like this:
# product_images/models/models.py
# -*- coding: utf-8 -*-
from odoo import models, fields, api, tools
class PublishingStatus(models.Model):
_name = 'product_images.publishing_status'
_description = 'Publishing status'
name = fields.Char(string="Name")
slug = fields.Char(string="Slug")
class ProductImage(models.Model):
_name = 'product_images.product_image'
_description = 'Product image'
name = fields.Char(string="Alternative text")
product_id = fields.Many2one('product.product', string='Product', ondelete='set null', index=True)
original_image = fields.Binary(string='Original image')
#api.model
def _get_default_state(self):
return self.env['product_images.publishing_status'].search([['slug', '=', 'draft']])
#api.model
def _get_all_states(self, groups, domain, order):
state_ids = self.env['product_images.publishing_status'].search([])
return state_ids
state_id = fields.Many2one(
'product_images.publishing_status',
string='Publishing status',
default=_get_default_state,
group_expand='_get_all_states',
)
#api.multi
def action_set_to_draft(self):
self.state_id = self.env['product_images.publishing_status'].search([['slug', '=', 'draft']])
#api.multi
def action_request_for_approval(self):
self.state_id = self.env['product_images.publishing_status'].search([['slug', '=', 'pending']])
#api.multi
def action_approve(self):
self.state_id = self.env['product_images.publishing_status'].search([['slug', '=', 'approved']])
#api.multi
def action_reject(self):
self.state_id = self.env['product_images.publishing_status'].search([['slug', '=', 'rejected']])
Then I have some data records for the publishing statuses:
<!-- product_images/data/data.xml -->
<odoo>
<data>
<!-- explicit list view definition -->
<record model="product_images.publishing_status" id="product_images.publishing_status_draft">
<field name="name">Draft</field>
<field name="slug">draft</field>
</record>
<record model="product_images.publishing_status" id="product_images.publishing_status_pending">
<field name="name">Pending</field>
<field name="slug">pending</field>
</record>
<record model="product_images.publishing_status" id="product_images.publishing_status_approved">
<field name="name">Approved</field>
<field name="slug">approved</field>
</record>
<record model="product_images.publishing_status" id="product_images.publishing_status_rejected">
<field name="name">Rejected</field>
<field name="slug">rejected</field>
</record>
</data>
</odoo>
I also have some records to create a workflow which allows to switch between the publishing statuses:
<odoo>
<data>
<record model="workflow" id="product_images.wkf_image_publishing">
<field name="name">Product Image Publishing Workflow</field>
<field name="osv">product_images.product_image</field>
<field name="on_create">True</field>
</record>
<record model="workflow.activity" id="product_images.wkf_activity_draft">
<field name="name">Draft</field>
<field name="wkf_id" ref="product_images.wkf_image_publishing" />
<field name="flow_start" eval="True" />
<field name="kind">function</field>
<field name="action">action_set_to_draft()</field>
</record>
<record model="workflow.activity" id="product_images.wkf_activity_pending">
<field name="name">Pending</field>
<field name="wkf_id" ref="product_images.wkf_image_publishing" />
<field name="kind">function</field>
<field name="action">action_request_for_approval()</field>
</record>
<record model="workflow.activity" id="product_images.wkf_activity_approved">
<field name="name">Approved</field>
<field name="wkf_id" ref="product_images.wkf_image_publishing" />
<field name="flow_stop" eval="True" />
<field name="kind">function</field>
<field name="action">action_approve()</field>
</record>
<record model="workflow.activity" id="product_images.wkf_activity_rejected">
<field name="name">Rejected</field>
<field name="wkf_id" ref="product_images.wkf_image_publishing" />
<field name="flow_stop" eval="True" />
<field name="kind">function</field>
<field name="action">action_reject()</field>
</record>
<record model="workflow.transition" id="product_images.wkf_transition_draft_to_pending">
<field name="act_from" ref="product_images.wkf_activity_draft" />
<field name="act_to" ref="product_images.wkf_activity_pending" />
<field name="condition">name != "" and original_image != ""</field>
<field name="signal">pending</field>
</record>
<record model="workflow.transition" id="product_images.wkf_transition_pending_to_draft">
<field name="act_from" ref="product_images.wkf_activity_pending" />
<field name="act_to" ref="product_images.wkf_activity_draft" />
<field name="signal">draft</field>
</record>
<record model="workflow.transition" id="product_images.wkf_transition_pending_to_approved">
<field name="act_from" ref="product_images.wkf_activity_pending" />
<field name="act_to" ref="product_images.wkf_activity_approved" />
<field name="signal">approve</field>
</record>
<record model="workflow.transition" id="product_images.wkf_transition_pending_to_rejected">
<field name="act_from" ref="product_images.wkf_activity_pending" />
<field name="act_to" ref="product_images.wkf_activity_rejected" />
<field name="signal">reject</field>
</record>
</data>
</odoo>
And now the tickiest part! I need a form with the buttons to switch between workflow states and a status bar showing the currently active status. This is what I tried:
<record model="ir.ui.view" id="product_images.form">
<field name="name">Product Image</field>
<field name="model">product_images.product_image</field>
<field name="arch" type="xml">
<form>
<header>
<!--
<button name="draft"
type="workflow"
string="Set to draft"
attrs="{'invisible': [('state_id.slug','not in',['pending'])]}"
/>
<button name="pending"
type="workflow"
string="Request for approval"
attrs="{'invisible': [('state_id.slug','not in',['draft'])]}"
/>
<button name="approve"
type="workflow"
string="Approve"
attrs="{'invisible': [('state_id.slug','not in',['pending'])]}"
class="oe_highlight"
/>
<button name="reject"
type="workflow"
string="Reject"
attrs="{'invisible': [('state_id.slug','not in',['pending'])]}"
class="oe_highlight"
/>
-->
<field name="state_id" widget="statusbar" />
</header>
<sheet>
<group>
<field name="product_id" />
<field name="name" string="Alternative text" />
<field name="original_image" widget="image" class="oe_avatar" />
<field name="state_id" />
</group>
</sheet>
</form>
</field>
</record>
The problems I got:
The status bar is shown, but the current publishing status is not activated.
If I uncomment the buttons, they throw an error about invalid domain:
Uncaught Error: Unknown field state_id.slug in domain
[["state_id.slug","not in",["pending"]]]
What am I missing?

Answer 1

In domain attribute, we can not use parent field in left hand side. In your case, we need to add related field.
For example:
class ProductImage(models.Model):
_name = 'product_images.product_image'
slug = fields.Char(related='state_id.slug', string='Slug', store=True)
Put slug field after state_id in your view file
<field name="slug" invisible="1"/>
Now uncomment <button> codes.
Afterwards, restart Odoo server and upgrade your custom module.