Refactor registrars

#765

db/migrate/20180309053424_add_registrars_unique_constraints.rb

@@ -0,0 +1,17 @@
+class AddRegistrarsUniqueConstraints < ActiveRecord::Migration
+  def up
+    execute <<-SQL
+      ALTER TABLE registrars ADD CONSTRAINT unique_name UNIQUE (name);
+      ALTER TABLE registrars ADD CONSTRAINT unique_reference_no UNIQUE (reference_no);
+      ALTER TABLE registrars ADD CONSTRAINT unique_code UNIQUE (code);
+    SQL
+  end
+
+  def down
+    execute <<-SQL
+      ALTER TABLE registrars DROP CONSTRAINT unique_name;
+      ALTER TABLE registrars DROP CONSTRAINT unique_reference_no;
+      ALTER TABLE registrars DROP CONSTRAINT unique_code;
+    SQL
+  end
+end

db/migrate/20180309053921_remove_registrars_indexes.rb

@@ -0,0 +1,6 @@
+class RemoveRegistrarsIndexes < ActiveRecord::Migration
+  def change
+    remove_index :registrars, name: :index_registrars_on_code
+    remove_index :registrars, name: :index_registrars_on_legacy_id
+  end
+end

db/migrate/20180309054510_add_registrars_not_null_constraints.rb

@@ -0,0 +1,9 @@
+class AddRegistrarsNotNullConstraints < ActiveRecord::Migration
+  def change
+    change_column_null :registrars, :name, false
+    change_column_null :registrars, :reg_no, false
+    change_column_null :registrars, :country_code, false
+    change_column_null :registrars, :email, false
+    change_column_null :registrars, :code, false
+  end
+end