Make the project field in the tags table nullable so it is (hopefully)

optional on setups with enabled foreign key constraints.

src/IDF/Forge.php

@@ -53,7 +53,7 @@ class IDF_Forge
     }
 
     public function getProjectLabelsWithCounts() {
-        $sql = new Pluf_SQL('project=0');
+        $sql = new Pluf_SQL('project IS NULL');
         $tagList = Pluf::factory('IDF_Tag')->getList(array(
             'filter' => $sql->gen(),
             'view' => 'join_projects',

src/IDF/Migrations/25NullableProjectInTag.php

@@ -0,0 +1,46 @@
+<?php
+/* -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+# ***** BEGIN LICENSE BLOCK *****
+# This file is part of InDefero, an open source project management application.
+# Copyright (C) 2008-2011 Céondo Ltd and contributors.
+#
+# InDefero is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# InDefero is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+# ***** END LICENSE BLOCK ***** */
+
+function IDF_Migrations_25NullableProjectInTag_up($params=null)
+{
+    $engine = Pluf::f('db_engine');
+    $db = Pluf::db();
+
+    if ($engine === 'PostgreSQL') {
+        $db->execute('ALTER TABLE '.$db->pfx.'idf_tags ALTER COLUMN project DROP NOT NULL');
+    } else if ($engine === 'MySQL') {
+        $db->execute('ALTER TABLE '.$db->pfx.'idf_tags MODIFY project MEDIUMINT NULL');
+        // this is only needed for non-transactional setups where MySQL set 0 as default value
+        $db->execute('UPDATE '.$db->pfx.'idf_tags SET project=NULL WHERE project=0');
+    }
+}
+
+function IDF_Migrations_25NullableProjectInTag_down($params=null)
+{
+    $db = Pluf::db();
+    if ($engine === 'PostgreSQL') {
+        $db->execute('ALTER TABLE '.$db->pfx.'idf_tags ALTER COLUMN project SET NOT NULL');
+    } else if ($engine === 'MySQL') {
+        $db->execute('ALTER TABLE '.$db->pfx.'idf_tags MODIFY project MEDIUMINT NOT NULL');
+    }
+}

src/IDF/Tag.php

@@ -48,7 +48,8 @@ class IDF_Tag extends Pluf_Model
                             array(
                                   'type' => 'Pluf_DB_Field_Foreignkey',
                                   'model' => 'IDF_Project',
-                                  'blank' => false,
+                                  'blank' => true,
+                                  'is_null' => true,
                                   'verbose' => __('project'),
                                   ),
                             'class' =>
@@ -147,7 +148,7 @@ class IDF_Tag extends Pluf_Model
         $class = trim($class);
         $name = trim($name);
         $gtag = new IDF_Tag();
-        $sql = new Pluf_SQL('class=%s AND lcname=%s AND project=0',
+        $sql = new Pluf_SQL('class=%s AND lcname=%s AND project IS NULL',
                             array($class, mb_strtolower($name)));
         $tags = $gtag->getList(array('filter' => $sql->gen()));
         if ($tags->count() < 1) {

src/IDF/Template/MarkdownForge.php

@@ -83,7 +83,7 @@ class IDF_Template_MarkdownForge extends Pluf_Template_Tag
                     $name = $class;
                     $class = IDF_TAG_DEFAULT_CLASS;
                 }
-                $sql = new Pluf_SQL('class=%s AND lcname=%s AND project=0',
+                $sql = new Pluf_SQL('class=%s AND lcname=%s AND project IS NULL',
                                     array(strtolower($class), mb_strtolower($name)));
                 $tag = Pluf::factory('IDF_Tag')->getOne(array('filter' => $sql->gen()));
             }