Use attribute pairs instead of the migration name to create add and remove column migrations. Closes #9166 [lifofifo]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7422 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

railties/CHANGELOG

@@ -1,5 +1,15 @@
 *SVN*
 
+* Use attribute pairs instead of the migration name to create add and remove column migrations.  Closes #9166 [lifofifo]
+
+	For example:
+
+	ruby script/generation migration AddSomeStuffToCustomers first_name:string last_name:string
+	
+	or
+	
+	ruby script/generation migration RemoveSomeStuffFromCustomers first_name:string last_name:string
+
 * Add ActiveResource to Rails::Info.  Closes #8741 [kampers]
 
 * use Gem.find_name instead of search when freezing gems.  Prevent false positives for other gems with rails in the name. Closes #8729 [wselman]

railties/lib/rails_generator/generators/components/migration/USAGE

@@ -1,10 +1,11 @@
 Description:
     Stubs out a new database migration. Pass the migration name, either
-    CamelCased or under_scored, as an argument. A migration class is generated
-    in db/migrate prefixed by the latest migration number.
+    CamelCased or under_scored, and an optional list of attribute pairs as arguments.
+
+    A migration class is generated in db/migrate prefixed by the latest migration number.
 
     You can name your migration in either of these formats to generate add/remove
-    column lines: AddColumnToTable or RemoveColumnFromTable
+    column lines from supplied attributes: AddColumnsToTable or RemoveColumnsFromTable
 
 Example:
     `./script/generate migration AddSslFlag`
@@ -12,13 +13,17 @@ Example:
     With 4 existing migrations, this creates the AddSslFlag migration in
     db/migrate/005_add_ssl_flag.rb
 
-    `./script/generate migration AddSslFlagToAccount`
+    `./script/generate migration AddTitleBodyToPost title:string body:text published:boolean`
     
-    This will create the AddSslFlagToAccount in db/migrate/005_add_ssl_flag_to_account.rb with
+    This will create the AddTitleBodyToPost in db/migrate/005_add_title_body_to_post.rb with
     this in the Up migration:
 
-      add_column :accounts, :ssl_flag, :type, :null => :no?, :default => :maybe?
+      add_column :posts, :title, :string  
+      add_column :posts, :body, :text  
+      add_column :posts, :published, :boolean
 
     And this in the Down migration:
     
-      remove_column :accounts, :ssl_flag
+      remove_column :posts, :published  
+      remove_column :posts, :body  
+      remove_column :posts, :title

railties/lib/rails_generator/generators/components/migration/migration_generator.rb

@@ -1,19 +1,19 @@
-class MigrationGenerator < Rails::Generator::NamedBase
+class MigrationGenerator < Rails::Generator::NamedBase  
   def manifest
     record do |m|
-      m.migration_template 'migration.rb', 'db/migrate'
+      m.migration_template 'migration.rb', 'db/migrate', :assigns => get_local_assigns
     end
   end
-
-  def auto_migration direction
-    case class_name.underscore
-    when /^(add|remove)_(.*)_(?:to|from)_(.*)/ then
-      action, col, tbl = $1, $2, $3.pluralize
-
-      unless (action == "add") ^ (direction == :up) then
-        %(\n    add_column :#{tbl}, :#{col}, :type, :null => :no?, :default => :maybe?)
+  
+  private
+  
+  def get_local_assigns
+    returning(assigns = {}) do
+      if class_name.underscore =~ /^(add|remove)_.*_(?:to|from)_(.*)/
+        assigns[:migration_action] = $1
+        assigns[:table_name]       = $2.pluralize
       else
-        %(\n    remove_column :#{tbl}, :#{col})
+        assigns[:attributes] = []
       end
     end
   end

railties/lib/rails_generator/generators/components/migration/templates/migration.rb

@@ -1,7 +1,11 @@
 class <%= class_name.underscore.camelize %> < ActiveRecord::Migration
-  def self.up<%= auto_migration :up %>
+  def self.up<% attributes.each  do |attribute| %>
+    <%= migration_action %>_column :<%= table_name %>, :<%= attribute.name %><% if  migration_action == 'add' %>, :<%= attribute.type %><% end  -%>
+  <% end  %>
   end
 
-  def self.down<%= auto_migration :down %>
+  def self.down<% attributes.reverse.each  do |attribute| %>
+    <%= migration_action == 'add' ? 'remove' : 'add' %>_column :<%= table_name %>, :<%= attribute.name %><% if migration_action == 'remove' %>, :<%= attribute.type %><% end  -%>
+  <% end  %>
   end
 end