Added proper USAGE to the scaffold_resource generator [DHH]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5234 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

railties/lib/rails_generator/generators/components/scaffold_resource/USAGE

@@ -1,8 +1,23 @@
 Description:
-    Explain the generator
+    The scaffold resource generator creates a model, a controller, and a set of templates for use in a REST-like,
+    resource-oriented fashion. This basically means that it follows a set of conventions to exploit the full set of
+    HTTP verbs (GET/POST/PUT/DELETE) and is prepared for multi-client access (like one view for HTML, one for an XML
+    API, one for ATOM, etc). Everything comes with sample unit and functional tests as well.
+
+    The generator takes the name of the model as its first argument. This model name is then pluralized to get the 
+    controller name. So "scaffold_resource post" will generate a Post model and a PostsController and will be intended
+    for URLs like /posts and /posts/45.
+
+    As additional parameters, the generator will take attribute pairs described by name and type. These attributes will
+    be used to prepopulate the migration to create the table for the model and to give you a set of templates for the
+    view. For example, "scaffold_resource post title:string created_on:date body:text published:boolean" will give
+    you a model with those four attributes, forms to create and edit those models from, and an index that'll list them 
+    all.
+
+    You don't have to think up all attributes up front, but it's a good idea of adding just the baseline of what's 
+    needed to start really working with the resource.
 
 Example:
-    ./script/generate scaffold_resource Thing
-
-    This will create:
-        what/will/it/create
+    ./script/generate scaffold_resource post # no attributes, view will be anemic
+    ./script/generate scaffold_resource post title:string created_on:date body:text published:boolean
+    ./script/generate scaffold_resource purchase order_id:integer created_at:datetime amount:decimal