[FIX] base_multi_image - New storage backend 'Filestore' to link an existing attachment record + Fix the 'pre_init_hook_for_submodules()' hook to extract the images from the ir_attachment table for binary fields initialized with the 'attachment=True' parameter

base_multi_image/hooks.py

@@ -22,23 +22,44 @@ def pre_init_hook_for_submodules(cr, model, field):
     """
     env = api.Environment(cr, SUPERUSER_ID, dict())
     with cr.savepoint():
+        table = env[model]._table
+        column_exists = table_has_column(cr, table, field)
+        # Extract the binary content directly from the table
+        if column_exists:
+            extract_query = """
+                SELECT id, %%s, 'db', %(field)s
+                FROM %(table)s
+                WHERE %(field)s IS NOT NULL
+            """ % {"table": table, "field": field}
+            image_field = 'file_db_store'
+        # Extract the binary content from the ir_attachment table
+        else:
+            extract_query = """
+                SELECT res_id, res_model, 'filestore', id
+                FROM ir_attachment
+                WHERE res_field='%(field)s' AND res_model='%(model)s'
+            """ % {"model": model, "field": field}
+            image_field = 'attachment_id'
+
+        cr.execute(extract_query)
         cr.execute(
             """
                 INSERT INTO base_multi_image_image (
                     owner_id,
                     owner_model,
                     storage,
-                    file_db_store
+                    %s
                 )
-                SELECT
-                    id,
-                    %%s,
-                    'db',
-                    %(field)s
-                FROM
-                    %(table)s
-                WHERE
-                    %(field)s IS NOT NULL
-            """ % {"table": env[model]._table, "field": field},
-            (model,)
+                %s
+            """ % (image_field, extract_query)
         )
+
+
+def table_has_column(cr, table, field):
+    query = """
+        SELECT %(field)s
+        FROM information_schema.columns
+        WHERE table_name=%(table)s and column_name=%(field)s;
+    """
+    cr.execute(query, {'table': table, 'field': field})
+    return bool(cr.fetchall())

base_multi_image/models/image.py

@@ -28,7 +28,8 @@ class Image(models.Model):
     owner_model = fields.Char(
         required=True)
     storage = fields.Selection(
-        [('url', 'URL'), ('file', 'OS file'), ('db', 'Database')],
+        [('url', 'URL'), ('file', 'OS file'), ('db', 'Database'),
+         ('filestore', 'Filestore')],
         required=True)
     name = fields.Char(
         'Image title',
@@ -37,6 +38,9 @@ class Image(models.Model):
     extension = fields.Char(
         'File extension',
         readonly=True)
+    attachment_id = fields.Many2one(
+        'ir.attachment',
+        string='Attachment')
     file_db_store = fields.Binary(
         'Image stored in database',
         filters='*.png,*.jpg,*.gif')
@@ -84,6 +88,10 @@ class Image(models.Model):
             "default_owner_%s" % f not in self.env.context
             for f in ("id", "model"))
 
+    @api.multi
+    def _get_image_from_filestore(self):
+        return self.attachment_id.datas
+
     @api.multi
     def _get_image_from_db(self):
         return self.file_db_store
@@ -157,6 +165,11 @@ class Image(models.Model):
             self.name, self.extension = os.path.splitext(self.filename)
             self.name = self._make_name_pretty(self.name)
 
+    @api.onchange('attachment_id')
+    def _onchange_attachmend_id(self):
+        if self.attachment_id:
+            self.name = self.attachment_id.res_name
+
     @api.constrains('storage', 'url')
     def _check_url(self):
         if self.storage == 'url' and not self.url:
@@ -174,3 +187,9 @@ class Image(models.Model):
         if self.storage == 'db' and not self.file_db_store:
             raise exceptions.ValidationError(
                 'You must provide an attached file for the image.')
+
+    @api.constrains('storage', 'attachment_id')
+    def _check_store(self):
+        if self.storage == 'filestore' and not self.attachment_id:
+            raise exceptions.ValidationError(
+                'You must provide an attachment for the image.')

base_multi_image/views/image_view.xml

@@ -50,6 +50,12 @@
                                 'required': [('storage', '=', 'db')],
                             }"
                             filename="filename"/>
+                        <field
+                            name="attachment_id"
+                            attrs="{
+                                'invisible': [('storage', '!=', 'filestore')],
+                                'required': [('storage', '=', 'filestore')],
+                            }"/>
                     </group>
                     <group string="Preview">
                         <field name="image_medium"