[IMP] project, project_issue: tasks and issue stat button on partner view

- Use read_group to compute task_count of res.partner
for performance sake
- When creating a task/issue from partner form view,
the default partner will be the current one (event if
the use case is rare)
- Only display button when count is greater than 0
- Also avoid default 'My Tasks' filter when coming from
partner form view

addons/project/models/project.py

@@ -387,11 +387,13 @@ class Task(models.Model):
 
     @api.onchange('project_id')
     def _onchange_project(self):
+        default_partner_id = self.env.context.get('default_partner_id')
+        default_partner = self.env['res.partner'].browse(default_partner_id) if default_partner_id else None
         if self.project_id:
-            self.partner_id = self.project_id.partner_id
+            self.partner_id = self.project_id.partner_id or default_partner
             self.stage_id = self.stage_find(self.project_id.id, [('fold', '=', False)])
         else:
-            self.partner_id = False
+            self.partner_id = default_partner
             self.stage_id = False
 
     @api.onchange('user_id')

addons/project/models/res_partner.py

@@ -12,5 +12,7 @@ class ResPartner(models.Model):
     task_count = fields.Integer(compute='_compute_task_count', string='# Tasks')
 
     def _compute_task_count(self):
+        fetch_data = self.env['project.task'].read_group([('partner_id', 'in', self.ids)], ['partner_id'], ['partner_id'])
+        result = dict((data['partner_id'][0], data['partner_id_count']) for data in fetch_data)
         for partner in self:
-            partner.task_count = len(partner.task_ids)
+            partner.task_count = result.get(partner.id, 0)

addons/project/views/project_views.xml

@@ -574,6 +574,13 @@ action = model.activate_sample_project()
 
         <menuitem action="action_view_task" id="menu_action_view_task" parent="project.menu_project_management" sequence="5"/>
 
+        <record id="project_task_action_from_partner" model="ir.actions.act_window">
+            <field name="name">Tasks</field>
+            <field name="res_model">project.task</field>
+            <field name="view_mode">kanban,tree,form</field>
+            <field name="search_view_id" ref="view_task_search_form"/>
+        </record>
+
         <record id="action_view_task_overpassed_draft" model="ir.actions.act_window">
             <field name="name">Overpassed Tasks</field>
             <field name="res_model">project.task</field>

addons/project/views/res_partner_views.xml

@@ -10,8 +10,8 @@
             <field name="groups_id" eval="[(4, ref('project.group_project_user'))]"/>
             <field name="arch" type="xml">
                 <button name="toggle_active" position="before">
-                    <button class="oe_stat_button" type="action" name="%(action_view_task)d" 
-                        context="{'search_default_partner_id': active_id, 'default_partner_id': active_id}"
+                    <button class="oe_stat_button" type="action" name="%(project_task_action_from_partner)d"
+                        context="{'search_default_partner_id': active_id, 'default_partner_id': active_id}" attrs="{'invisible': [('task_count', '=', 0)]}"
                         icon="fa-tasks">
                         <field  string="Tasks" name="task_count" widget="statinfo"/>
                     </button>

addons/project_issue/models/project_issue.py

@@ -123,14 +123,16 @@ class ProjectIssue(models.Model):
 
     @api.onchange('project_id')
     def _onchange_project_id(self):
+        default_partner_id = self.env.context.get('default_partner_id')
+        default_partner = self.env['res.partner'].browse(default_partner_id) if default_partner_id else self.env['res.partner']
         if self.project_id:
             if not self.partner_id and not self.email_from:
                 self.partner_id = self.project_id.partner_id.id
                 self.email_from = self.project_id.partner_id.email
             self.stage_id = self.stage_find(self.project_id.id, [('fold', '=', False)])
         else:
-            self.partner_id = False
-            self.email_from = False
+            self.partner_id = default_partner
+            self.email_from = default_partner.email
             self.stage_id = False
 
     @api.onchange('task_id')

addons/project_issue/views/project_issue_views.xml

@@ -282,6 +282,13 @@
             </field>
         </record>
 
+        <record id="project_issue_action_from_partner" model="ir.actions.act_window">
+            <field name="res_model">project.issue</field>
+            <field name="view_type">form</field>
+            <field name="name">Issues</field>
+            <field name="view_mode">kanban,tree,form</field>
+        </record>
+
         <record id="project_issue_categ_act0" model="ir.actions.act_window">
             <field name="name">Issues</field>
             <field name="res_model">project.issue</field>

addons/project_issue/views/res_partner_views.xml

@@ -9,9 +9,9 @@
         <field name="groups_id" eval="[(4, ref('project.group_project_user'))]"/>
         <field name="arch" type="xml">
             <button name="toggle_active" position="before">
-                <button class="oe_stat_button" type="action" name="%(action_view_issues)d"
+                <button class="oe_stat_button" type="action" name="%(project_issue_action_from_partner)d"
                     context="{'search_default_partner_id': commercial_partner_id, 'default_partner_id': active_id}"
-                    attrs="{'invisible': [('customer', '=', False)]}"
+                    attrs="{'invisible': ['|', ('customer', '=', False), ('issue_count', '=', 0)]}"
                     icon="fa-bug">
                     <field name="issue_count" string="Issues" widget="statinfo"/>
                 </button>