fix migrations when upgrading from previous versions / v1.0.1

Author: Tobias Fischer

Diff for: db/migrate/001_create_project_aliases.rb

@@ -1,11 +1,13 @@
 class CreateProjectAliases < ActiveRecord::Migration
 
     def self.up
-        create_table :project_aliases do |t|
-            t.column :project_id, :integer, :null => false
-            t.column :alias,      :string,  :null => false
+        unless table_exists? :project_aliases
+            create_table :project_aliases do |t|
+                t.column :project_id, :integer, :null => false
+                t.column :alias,      :string,  :null => false
+            end
+            add_index :project_aliases, [ :alias ], :unique => true, :name => :project_alias
         end
-        add_index :project_aliases, [ :alias ], :unique => true, :name => :project_alias
     end
 
     def self.down

Diff for: db/migrate/002_add_project_aliases_undeletable.rb

@@ -1,7 +1,9 @@
 class AddProjectAliasesUndeletable < ActiveRecord::Migration
 
     def self.up
-        add_column :project_aliases, :undeletable, :boolean, :default => false, :null => false
+        unless column_exists? :project_aliases, :undeletable
+            add_column :project_aliases, :undeletable, :boolean, :default => false, :null => false
+        end
     end
 
     def self.down

Diff for: init.rb

@@ -21,7 +21,7 @@
   author 'Andriy Lesyuk & Tobias Fischer'
   description 'Allows adding project identifier aliases or renaming of project identifiers.'
   url 'https://github.com/paginagmbh/redmine_project-alias-2'
-  version '1.0.0'
+  version '1.0.1'
   requires_redmine :version_or_higher => '2.6'
 
   menu :admin_menu, :project_aliases,