[14.0][FIX] project_milestone : Wrong assignment of tasks to mileston…

…es when duplicating a project OCA#1283

project_milestone/models/project.py

@@ -17,3 +17,22 @@ class Project(models.Model):
     def _onchange_use_milestones(self):
         if not self.use_milestones and self.milestones_required:
             self.milestones_required = False
+
+    @api.returns("self", lambda value: value.id)
+    def copy(self, default=None):
+        default = dict(default or {})
+        project = super(Project, self).copy(default)
+        project._link_tasks_to_milestones()
+        return project
+
+    def _link_tasks_to_milestones(self):
+        for task in self.with_context(active_test=False).task_ids.filtered(
+            "milestone_id"):
+            task.milestone_id = self._find_equivalent_milestone(task.milestone_id)
+
+    def _find_equivalent_milestone(self, milestone):
+        return next((m for m in self.with_context(active_test=False).milestone_ids if
+                     m.name == milestone.name), None, )
+
+
+

project_milestone/models/project_milestone.py

@@ -41,3 +41,4 @@ def _compute_milestone_progress(self):
                 record.progress = (closed_tasks_count / total_tasks_count) * 100
             else:
                 record.progress = 0.0
+

project_milestone/views/project.xml

@@ -15,6 +15,7 @@
         </field>
     </record>
     <!-- Form View -->
+
     <record id="project_enhancement_milestone_view_inherit_form" model="ir.ui.view">
         <field name="name">project.milestone.form</field>
         <field name="model">project.project</field>