From f2d71fc4059692d01879f33b901c71d8a5e1eb13 Mon Sep 17 00:00:00 2001
From: Valentin Chemiere <valentin.chemiere@akretion.com>
Date: Mon, 16 Mar 2015 14:11:46 +0100
Subject: [PATCH] Polymorphic inherit for ir.attachment

---
 external_file_location/attachment.py       |  4 ++--
 external_file_location/attachment_view.xml | 17 ++++++++++++-----
 external_file_location/task.py             |  2 +-
 ir_attachment_metadata/attachment.py       |  7 +++++--
 ir_attachment_metadata/attachment_view.xml |  9 ++++-----
 5 files changed, 24 insertions(+), 15 deletions(-)

diff --git a/external_file_location/attachment.py b/external_file_location/attachment.py
index 63d18b49..26925547 100644
--- a/external_file_location/attachment.py
+++ b/external_file_location/attachment.py
@@ -23,8 +23,8 @@
 from openerp import models, fields
 
 
-class IrAttachment(models.Model):
-    _inherit = 'ir.attachment'
+class IrAttachmentMetadata(models.Model):
+    _inherit = 'ir.attachment.metadata'
 
     sync_date = fields.Datetime()
     state = fields.Selection([
diff --git a/external_file_location/attachment_view.xml b/external_file_location/attachment_view.xml
index b5f5309c..de7c65f9 100644
--- a/external_file_location/attachment_view.xml
+++ b/external_file_location/attachment_view.xml
@@ -3,8 +3,8 @@
     <data>
 
         <record id="view_attachment_improved_form" model="ir.ui.view">
-            <field name="model">ir.attachment</field>
-            <field name="inherit_id" ref="base.view_attachment_form" />
+            <field name="model">ir.attachment.metadata</field>
+            <field name="inherit_id" ref="ir_attachment_metadata.view_attachment_improved_form" />
             <field name="arch" type="xml">
             <field name="url" position="after">
                 <field name="sync_date"/>
@@ -17,7 +17,7 @@
         </record>
 
         <record id="view_external_attachment_tree" model="ir.ui.view">
-            <field name="model">ir.attachment</field>
+            <field name="model">ir.attachment.metadata</field>
             <field name="arch" type="xml">
                 <tree string="Attachments" >
                     <field name="name"/>
@@ -32,7 +32,7 @@
         </record>
 
         <record id="view_external_attachment_search" model="ir.ui.view">
-            <field name="model">ir.attachment</field>
+            <field name="model">ir.attachment.metadata</field>
             <field name="arch" type="xml">
                 <search string="Attachments">
                     <field name="name" filter_domain="['|', ('name','ilike',self), ('datas_fname','ilike',self)]" string="Attachment"/>
@@ -68,7 +68,7 @@
         <record id="action_attachment" model="ir.actions.act_window">
             <field name="name">Attachments</field>
             <field name="type">ir.actions.act_window</field>
-            <field name="res_model">ir.attachment</field>
+            <field name="res_model">ir.attachment.metadata</field>
             <field name="view_type">form</field>
             <field name="view_mode">tree,form</field>
             <field name="view_id" eval="False"/>
@@ -83,6 +83,13 @@
             <field name="act_window_id" ref="action_attachment"/>
         </record>
 
+        <record id="ir_attachment_view3" model="ir.actions.act_window.view">
+            <field eval="10" name="sequence"/>
+            <field name="view_mode">form</field>
+            <field name="view_id" ref="view_attachment_improved_form"/>
+            <field name="act_window_id" ref="action_attachment"/>
+        </record>
+
         <menuitem id="menu_ir_attachment" 
             parent="menu_file_exchange"
             sequence="20"
diff --git a/external_file_location/task.py b/external_file_location/task.py
index 11b5c955..befbb093 100644
--- a/external_file_location/task.py
+++ b/external_file_location/task.py
@@ -37,7 +37,7 @@ class Task(models.Model):
     filepath = fields.Char(help='Path to imported file')
     location_id = fields.Many2one('external.file.location', string='Location',
                                   required=True)
-    attachment_ids = fields.One2many('ir.attachment', 'task_id',
+    attachment_ids = fields.One2many('ir.attachment.metadata', 'task_id',
                                      string='Attachment')
     move_path = fields.Char(string='Move path',
                             help='Imported File will be moved to this path')
diff --git a/ir_attachment_metadata/attachment.py b/ir_attachment_metadata/attachment.py
index 801ab51b..b75ff47a 100644
--- a/ir_attachment_metadata/attachment.py
+++ b/ir_attachment_metadata/attachment.py
@@ -28,11 +28,14 @@ import hashlib
 from base64 import b64decode
 
 
-class IrAttachment(models.Model):
-    _inherit = 'ir.attachment'
+class IrAttachmentMetadata(models.Model):
+    _name = 'ir.attachment.metadata'
+    _inherits = {'ir.attachment': 'attachment_id'}
 
     internal_hash = fields.Char(store=True, compute='_compute_hash')
     external_hash = fields.Char()
+    attachment_id = fields.Many2one('ir.attachment', required=True,
+                                    ondelete='cascade')
 
     @api.depends('datas', 'external_hash')
     def _compute_hash(self):
diff --git a/ir_attachment_metadata/attachment_view.xml b/ir_attachment_metadata/attachment_view.xml
index 04b10055..a9553559 100644
--- a/ir_attachment_metadata/attachment_view.xml
+++ b/ir_attachment_metadata/attachment_view.xml
@@ -3,14 +3,13 @@
     <data>
 
 	    <record id="view_attachment_improved_form" model="ir.ui.view">
-	        <field name="model">ir.attachment</field>
+	        <field name="model">ir.attachment.metadata</field>
 	    	<field name="inherit_id" ref="base.view_attachment_form" />
 	        <field name="arch" type="xml">
-		    <field name="url" position="after">
-			    <field name="internal_hash"/>
-			    <field name="external_hash"/>
+		        <field name="url" position="after">
+			        <field name="internal_hash"/>
+			        <field name="external_hash"/>
 	    	    </field>
-	    		
 	        </field>
 	    </record>