Get tasks from a selected project - odoo

Question

I'm trying to implement a many2one selection field where you select a project from. If you've selected a project then there's another many2one field where you can select the task from. These task all need to be from the selected project.
Currently I got this (note that I couldn't test it because I kept getting an XML error):
class purchase_order(osv.osv):
_inherit = 'purchase.order'
def get_task(self, cr, uid, ids, project_id, context=None):
task_obj = self.pool.get('project.task')
for task in task_obj.browse(cr, uid, ids, context):
task_ids = task_obj.search(cr, uid, [(task.project_id.id, '=', project_id)])
ids_cus = []
for cus in task_obj.browse(cr, uid, task_ids, context):
if cus.project.id.id not in ids_cus:
ids_cus.append(cus.project_id.id)
self.write(cr, uid, ids, {'state_readonly': 'listed', 'task_ids': [(6, 0, ids_cus)]})
return True
_columns = {
'project_id': fields.many2one('project.project', 'Project'),
'task_id': fields.selection(get_task, 'Select task'),
}
And my XML looks like this:
<record id="purchase_order_form" model="ir.ui.view">
<field name="name">purchase.order.form</field>
<field name="model">purchase.order</field>
<field name="inherit_id" ref="purchase.purchase_order_form"/>
<field name="arch" type="xml">
<field name="origin" position="after">
<field name="project_id" on_change="_get_task(project_id)"/>
<field name="task_id" selection="widget"/>
</field>
</field>
</record>
What am I doing wrong with the XML here? And might there be another way?

Answer 1

No need to write method to filter tasks according to project in your case just change few things as follow.
class purchase_order(osv.osv):
_inherit = 'purchase.order'
_columns = {
'project_id': fields.many2one('project.project', 'Project'),
'task_id': fields.many2one('project.task', 'Tasks'),
}
and change your xml,
<record id="purchase_order_form" model="ir.ui.view">
<field name="name">purchase.order.form</field>
<field name="model">purchase.order</field>
<field name="inherit_id" ref="purchase.purchase_order_form"/>
<field name="arch" type="xml">
<field name="origin" position="after">
<field name="project_id" />
<field name="task_id" domain="[('project_id','=',project_id.id)]" widget="selection" />
</field>
</field>
</record>
In your existing code you have made small mistake,
selection="widget" is not valid in xml you should write widget="selection"

Answer 2

This solved my problem, I've added a fields.related for chained fields:
_columns = {
'task_id': fields.related('project_id', 'tasks', type='many2one', relation='project.task', store=True,
string='Task')
}
And then adjust my XML (Like #Empiro Technologies said):
<record id="purchase_order_form" model="ir.ui.view">
<field name="name">purchase.order.form</field>
<field name="model">purchase.order</field>
<field name="inherit_id" ref="purchase.purchase_order_form"/>
<field name="arch" type="xml">
<field name="origin" position="after">
<field name="project_id"/>
<field name="task_id" domain="[('project_id','=', project_id)]"/>
</field>
</field>
</record>