Migration & Schema änderungen für Die Semester

db/migrate/20130729085446_create_lva_semester_join_table.rb

@@ -0,0 +1,21 @@
+class CreateLvaSemesterJoinTable < ActiveRecord::Migration
+  def self.up
+    create_table :lvas_semesters, :id=>false do |t|
+      t.integer  :lva_id
+      t.integer  :semester_id
+    end
+    add_index :lva_semesters, [:lva_id, :semester_id]
+    add_index :lva_semesters, :semester_id
+  end
+  def change
+    create_table :lvas_semesters, :id=>false do |t|
+      t.integer  :lva_id
+      t.integer  :semester_id
+    end
+    add_index :lva_semesters, [:lva_id, :semester_id]
+    add_index :lva_semesters, :semester_id
+  end 
+  def self.down
+    drop_table :lva_semesters
+  end
+end