Olivier Dony (OpenERP) has proposed merging 
lp:~openerp-dev/openobject-server/trunk-global-filters-odo into 
lp:openobject-server.

Requested reviews:
  Xavier (Open ERP) (xmo)

For more details, see:
https://code.launchpad.net/~openerp-dev/openobject-server/trunk-global-filters-odo/+merge/105458

This branch modifies ir.filters in order to make filters with NULL user_id 
global to all users.
By default global filters will be visible and editable by all users (further 
restrictions may later apply).
A global filter may exist with the same name as a "private" filter, hence 
clients should try to differentiate them upon display.

Some strange stuff is needed for the unique constraint in order to properly 
handle NULL user_id (NULL is always != NULL, but we want to enforce unique 
names for user_id NULL). A second regular constraint is added too, in order to 
provide a better error message to end-users, unfortunately such a regular 
constraint cannot cover all the restrictions we want, so the unique index is 
needed as well.

Clients that have a "Manage Filters" menu should be updated to pass the correct 
context to that action: 
    {'search_default_my_filters': True, 'search_default_model_id': model_name}

A global ir.rule was added to make sure normal users cannot modify other users' 
filters via the Manage Filters view.

Menus and view were slightly updated too.
-- 
https://code.launchpad.net/~openerp-dev/openobject-server/trunk-global-filters-odo/+merge/105458
Your team OpenERP R&D Team is subscribed to branch 
lp:~openerp-dev/openobject-server/trunk-global-filters-odo.
=== modified file 'openerp/addons/base/__openerp__.py'
--- openerp/addons/base/__openerp__.py	2012-04-05 16:52:00 +0000
+++ openerp/addons/base/__openerp__.py	2012-05-11 10:15:26 +0000
@@ -42,6 +42,7 @@
         'base_update.xml',
         'ir/wizard/wizard_menu_view.xml',
         'ir/ir.xml',
+        'ir/ir_filters.xml',
         'ir/ir_config_parameter_view.xml',
         'ir/workflow/workflow_view.xml',
         'ir/report/ir_report.xml',

=== modified file 'openerp/addons/base/ir/ir.xml'
--- openerp/addons/base/ir/ir.xml	2012-04-30 06:04:34 +0000
+++ openerp/addons/base/ir/ir.xml	2012-05-11 10:15:26 +0000
@@ -322,78 +322,7 @@
         <menuitem action="act_values_form_action" id="menu_values_form_action" parent="next_id_6"/>
         <menuitem action="act_values_form_defaults" id="menu_values_form_defaults" parent="next_id_6"/>
 
-        <!--Filters form view-->
-
-        <record id="ir_filters_view_form" model="ir.ui.view">
-            <field name="name">ir.filters.form</field>
-            <field name="model">ir.filters</field>
-            <field name="type">form</field>
-            <field name="arch" type="xml">
-                <form string="Filters">
-                    <group colspan="4" col="6" >
-                        <field name="name"/>
-                        <field name="model_id"/>
-                        <field name="user_id"/>
-                    </group>
-                    <group col="4" expand="1">
-                        <separator string="Domain" colspan="2" />
-                        <separator string="Context" colspan="2" />
-                        <field name="domain" nolabel="1" colspan="2"/>
-                        <field name="context" nolabel="1" colspan="2"/>
-                    </group>
-                </form>
-            </field>
-        </record>
-
-        <!--        Filters tree view-->
-
-        <record id="ir_filters_view_tree" model="ir.ui.view">
-             <field name="name">ir.filters.tree</field>
-            <field name="model">ir.filters</field>
-            <field name="type">tree</field>
-            <field name="arch" type="xml">
-                <tree string="Filters">
-                    <field name="name"/>
-                    <field name="model_id"/>
-                    <field name="user_id"/>
-                    <field name="domain" groups="base.group_no_one"/>
-                    <field name="context" groups="base.group_no_one"/>
-                </tree>
-            </field>
-        </record>
-
-        <!--Filters search view-->
-
-        <record id="ir_filters_view_search" model="ir.ui.view">
-            <field name="name">ir.filters.search</field>
-            <field name="model">ir.filters</field>
-            <field name="type">search</field>
-            <field name="arch" type="xml">
-                <search string="Filters">
-                    <field name="name"/>
-                    <field name="model_id"/>
-                    <field name="user_id">
-                        <filter icon="terp-personal" domain="[('user_id','in', (uid, False))]" help="Current User" name="My Filters" />
-                    </field>
-                </search>
-            </field>
-        </record>
-
-        <!--        Filters action-->
-
-        <record id="actions_ir_filters_view" model="ir.actions.act_window">
-            <field name="name">Filters</field>
-            <field name="type">ir.actions.act_window</field>
-            <field name="res_model">ir.filters</field>
-            <field name="view_type">form</field>
-            <field name="view_id" ref="ir_filters_view_tree"/>
-            <field name="search_view_id" ref="ir_filters_view_search"/>
-        </record>
-
-        <!--        Filters view menu-->
-
-        <menuitem parent="base.next_id_6" name="Filters"
-            id="menu_ir_filters" action="actions_ir_filters_view" />
+
 
         <record id="act_report_xml_view" model="ir.ui.view">
             <field name="name">ir.actions.report.xml</field>
@@ -848,7 +777,7 @@
             <field name="view_id" ref="view_view_tree"/>
             <field name="help">Views allows you to personalize each view of OpenERP. You can add new fields, move fields, rename them or delete the ones that you do not need.</field>
         </record>
-        <menuitem action="action_ui_view" id="menu_action_ui_view" parent="base.next_id_2"/>
+        <menuitem action="action_ui_view" id="menu_action_ui_view" parent="base.next_id_2" sequence="2"/>
 
 
         <!-- View customizations -->
@@ -893,7 +822,7 @@
             <field name="res_model">ir.ui.view.custom</field>
             <field name="help">Customized views are used when users reorganize the content of their dashboard views (via web client)</field>
         </record>
-        <menuitem id="menu_action_ui_view_custom" action="action_ui_view_custom" parent="base.next_id_2"/>
+        <menuitem id="menu_action_ui_view_custom" action="action_ui_view_custom" parent="base.next_id_2" sequence="3"/>
 
 
         <!-- Attachment -->

=== modified file 'openerp/addons/base/ir/ir_filters.py'
--- openerp/addons/base/ir/ir_filters.py	2012-02-07 17:59:27 +0000
+++ openerp/addons/base/ir/ir_filters.py	2012-05-11 10:15:26 +0000
@@ -37,35 +37,53 @@
         name = self.read(cr, uid, [id], ['name'])[0]['name']
         default.update({'name':_('%s (copy)') % name})
         return super(ir_filters, self).copy(cr, uid, id, default, context)
-   
+
     def get_filters(self, cr, uid, model):
-        act_ids = self.search(cr,uid,[('model_id','=',model),('user_id','=',uid)])
-        my_acts = self.read(cr, uid, act_ids, ['name', 'domain','context'])
+        """Obtain the list of filters available for the user on the given model.
+
+        :return: list of :meth:`~osv.read`-like dicts containing the ``name``,
+            ``domain``, ``user_id`` (m2o tuple) and ``context`` of the matching ``ir.filters``.
+        """
+        # available filters: private filters (user_id=uid) and public filters (uid=NULL) 
+        act_ids = self.search(cr, uid, [('model_id','=',model),('user_id','in',[uid, False])])
+        my_acts = self.read(cr, uid, act_ids, ['name', 'domain', 'context', 'user_id'])
         return my_acts
 
     def create_or_replace(self, cr, uid, vals, context=None):
-        filter_id = None
         lower_name = vals['name'].lower()
-        matching_filters = [x for x in self.get_filters(cr, uid, vals['model_id'])
-                                if x['name'].lower() == lower_name]
+        matching_filters = [f for f in self.get_filters(cr, uid, vals['model_id'])
+                                if f['name'].lower() == lower_name
+                                if (f['user_id'] and f['user_id'][0]) == vals.get('user_id', False)]
+        # When a filter exists for the same (name, model, user) triple, we simply
+        # replace its definition.
         if matching_filters:
             self.write(cr, uid, matching_filters[0]['id'], vals, context)
-            return False
+            return matching_filters[0]['id']
         return self.create(cr, uid, vals, context)
 
+    _sql_constraints = [
+        # Partial constraint, complemented by unique index (see below)
+        # Still useful to keep because it provides a proper error message when a violation
+        # occurs, as it shares the same prefix as the unique index. 
+        ('name_model_uid_unique', 'unique (name, model_id, user_id)', 'Filter names must be unique'),
+    ]
+
     def _auto_init(self, cr, context=None):
         super(ir_filters, self)._auto_init(cr, context)
         # Use unique index to implement unique constraint on the lowercase name (not possible using a constraint)
         cr.execute("SELECT indexname FROM pg_indexes WHERE indexname = 'ir_filters_name_model_uid_unique_index'")
         if not cr.fetchone():
-            cr.execute('CREATE UNIQUE INDEX "ir_filters_name_model_uid_unique_index" ON ir_filters (lower(name), model_id, user_id)')
+            cr.execute("""CREATE UNIQUE INDEX "ir_filters_name_model_uid_unique_index" ON ir_filters
+                            (lower(name), model_id, COALESCE(user_id,-1))""")
 
     _columns = {
         'name': fields.char('Filter Name', size=64, translate=True, required=True),
-        'user_id':fields.many2one('res.users', 'User', help="The user this filter is available to. When left empty the filter is usable by the system only."),
-        'domain': fields.text('Domain Value', required=True),
-        'context': fields.text('Context Value', required=True),
-        'model_id': fields.selection(_list_all_models, 'Object', size=64, required=True),
+        'user_id': fields.many2one('res.users', 'User', ondelete='cascade',
+                                   help="The user this filter is private to. When left empty the filter is public "
+                                        "and available to all users."),
+        'domain': fields.text('Domain', required=True),
+        'context': fields.text('Context', required=True),
+        'model_id': fields.selection(_list_all_models, 'Model', required=True),
     }
     _defaults = {
         'domain': '[]',

=== added file 'openerp/addons/base/ir/ir_filters.xml'
--- openerp/addons/base/ir/ir_filters.xml	1970-01-01 00:00:00 +0000
+++ openerp/addons/base/ir/ir_filters.xml	2012-05-11 10:15:26 +0000
@@ -0,0 +1,79 @@
+<?xml version="1.0" encoding="utf-8"?>
+<openerp>
+
+    <data noupdate="1">
+        <!-- Restrict modifications on ir.filters to owner only -->
+        <record id="ir_filters_rule" model="ir.rule">
+            <field name="name">ir.filters.owner</field>
+            <field model="ir.model" name="model_id" ref="model_ir_filters"/>
+            <field name="domain_force">[('user_id','in',[False,user.id])]</field>
+        </record>
+    </data>
+
+    <data>
+        <record id="ir_filters_view_form" model="ir.ui.view">
+            <field name="name">ir.filters.form</field>
+            <field name="model">ir.filters</field>
+            <field name="type">form</field>
+            <field name="arch" type="xml">
+                <form string="Filters">
+                    <group colspan="4" col="6" >
+                        <field name="name"/>
+                        <field name="model_id"/>
+                        <field name="user_id"/>
+                    </group>
+                    <group col="4" expand="1">
+                        <separator string="Domain" colspan="2" />
+                        <separator string="Context" colspan="2" />
+                        <field name="domain" nolabel="1" colspan="2"/>
+                        <field name="context" nolabel="1" colspan="2"/>
+                    </group>
+                </form>
+            </field>
+        </record>
+
+        <record id="ir_filters_view_tree" model="ir.ui.view">
+             <field name="name">ir.filters.tree</field>
+            <field name="model">ir.filters</field>
+            <field name="type">tree</field>
+            <field name="arch" type="xml">
+                <tree string="Filters">
+                    <field name="name"/>
+                    <field name="model_id"/>
+                    <field name="user_id"/>
+                    <field name="domain" groups="base.group_no_one"/>
+                    <field name="context" groups="base.group_no_one"/>
+                </tree>
+            </field>
+        </record>
+
+        <record id="ir_filters_view_search" model="ir.ui.view">
+            <field name="name">ir.filters.search</field>
+            <field name="model">ir.filters</field>
+            <field name="type">search</field>
+            <field name="arch" type="xml">
+                <search string="Filters">
+                    <filter string="Personal" domain="[('user_id','!=',False)]" help="Filters visible only for one user"/>
+                    <filter string="Shared" domain="[('user_id','=',False)]" help="Filters shared with all users"/>
+                    <separator orientation="vertical"/>
+                    <field name="name"/>
+                    <field name="model_id"/>
+                    <field name="user_id">
+                        <filter icon="terp-personal" domain="[('user_id','in',(uid, False))]"
+                                name="my_filters"
+                                string="My Filters" />
+                    </field>
+                </search>
+            </field>
+        </record>
+
+        <record id="actions_ir_filters_view" model="ir.actions.act_window">
+            <field name="name">Filters</field>
+            <field name="type">ir.actions.act_window</field>
+            <field name="res_model">ir.filters</field>
+        </record>
+
+        <menuitem parent="base.next_id_2" name="User-defined Filters"
+            id="menu_ir_filters" action="actions_ir_filters_view" sequence="5"/>
+    </data>
+</openerp>
\ No newline at end of file

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