add function for search of equipments

equipment.py

@@ -87,9 +87,9 @@ class OpticalEquipment(Workflow, ModelSQL, ModelView):
                         'equipment','subscription', "Subscriptions",
                         states={'readonly': True}
                                             )
-    maintenance_history = fields.Many2Many('optical_equipment.maintenance-optical_equipment.equipment', 'equipment', 'maintenance', "Maintenances",
-                                           states={'readonly': True}
-                                           )
+    maintenance_history = fields.Function(
+        fields.Many2Many('optical_equipment.maintenance-optical_equipment.equipment',
+                         'equipment', 'maintenance',"Maintenances"), 'get_maintenances_of_equipment')
     software_version = fields.Char("Software version", size=None,
                                    states=_states,)
 
@@ -130,6 +130,16 @@ class OpticalEquipment(Workflow, ModelSQL, ModelView):
             else:
                 raise UserError(gettext('optical_equipment.msg_not_sequence_equipment'))
 
+
+
+    def get_maintenances_of_equipment(self, records):
+        raise UserError(str(self))
+        pool = Pool()
+        MaintenancesEquipment = pool.get('optical_equipment.maintenance')
+        maintenancesEquipment = set()
+
+        pass
+    
     @classmethod
     def default_state(cls):
        return 'draft'
@@ -206,12 +216,9 @@ class OpticalEquipment(Workflow, ModelSQL, ModelView):
             
 
 
-class EquipmentMaintenance(ModelSQL):
+class EquipmentMaintenance(ModelSQL, ModelView):
     'Optical Equipment - Equipment - Maintenance'
     __name__='optical_equipment.maintenance-optical_equipment.equipment'
 
-    maintenance = fields.Many2One('optical_equipment.maintenance', 'Maintenances', select=True)
-
     equipment = fields.Many2One('optical_equipment.equipment', 'Equipment', select=True)
-
-    
+    maintenance = fields.Many2One('optical_equipment.maintenance', 'Maintenances', select=True)    

maintenance.xml

@@ -18,6 +18,11 @@
 	    <field name="type">form</field>
 	    <field name="name">maintenance_form</field>
 	</record>
+	<record model="ir.ui.view" id= "maintenance_equipment_view_form">
+	    <field name="model">optical_equipment.maintenance-optical_equipment.equipment</field>
+	    <field name="inherit" ref="maintenance_view_form"/>
+	    <field name="name">maintenance_equipment_form</field>
+	</record>
 	<record model="ir.action.act_window.view" id="act_maintenance_view1">
             <field name="sequence" eval="10"/>
 	    <field name="view" ref="maintenance_view_tree"/>

view/maintenance_form.xml

@@ -14,7 +14,6 @@
     <field name="maintenance_type"/>
     <label name="equipment"/>
     <field name="equipment"/>
-    <newline/>
     <notebook colspan="6">
 	<page string="Agended" id="agended">
 	    <label name="estimated_agended"/>