Support creating a table migration generator

Sometimes you want to create a table without an associated model and
test, which is also not a join table. With this commit, you can now
do that.

Example:

    rails g migration create_posts title:string
or
    rails g migration CreatePosts title:string

This commit also moves the template the model generator uses for the
migration to the migration templates folder, as it seems a more
sensible place for it now that it is shared code.

1 files changed, 15 insertions, 0 deletions

diff --git a/activerecord/lib/rails/generators/active_record/migration/templates/create_table_migration.rb b/activerecord/lib/rails/generators/active_record/migration/templates/create_table_migration.rb
new file mode 100644
index 0000000000..3a3cf86d73
--- /dev/null
+++ b/activerecord/lib/rails/generators/active_record/migration/templates/create_table_migration.rb
@@ -0,0 +1,15 @@
+class <%= migration_class_name %> < ActiveRecord::Migration
+  def change
+    create_table :<%= table_name %> do |t|
+<% attributes.each do |attribute| -%>
+      t.<%= attribute.type %> :<%= attribute.name %><%= attribute.inject_options %>
+<% end -%>
+<% if options[:timestamps] %>
+      t.timestamps
+<% end -%>
+    end
+<% attributes_with_index.each do |attribute| -%>
+    add_index :<%= table_name %>, :<%= attribute.index_name %><%= attribute.inject_index_options %>
+<% end -%>
+  end
+end