git init

db/migrate/20120325031259_create_team_memberships.example

@@ -0,0 +1,17 @@
+class CreateTeamMemberships < ActiveRecord::Migration
+  def up
+    create_table :team_memberships do |t|
+      t.references :user, :null => false
+      t.references :team, :null => false
+      t.timestamps
+    end
+    add_index :team_memberships, :user_id
+    add_index :team_memberships, :team_id
+  end
+
+  def down
+    remove_index :team_memberships, :column => :team_id
+    remove_index :team_memberships, :column => :user_id
+    drop_table :team_memberships
+  end
+end