i438 - fix erroring migrations (#487)

db/migrate/20211203195233_rename_children_counters_to_relationships.rb

@@ -1,6 +1,6 @@
 class RenameChildrenCountersToRelationships < ActiveRecord::Migration[5.2]
   def change
-    rename_column :bulkrax_importer_runs, :processed_children, :processed_relationships
-    rename_column :bulkrax_importer_runs, :failed_children, :failed_relationships
+    rename_column :bulkrax_importer_runs, :processed_children, :processed_relationships unless column_exists?(:bulkrax_importer_runs, :processed_relationships)
+    rename_column :bulkrax_importer_runs, :failed_children, :failed_relationships unless column_exists?(:bulkrax_importer_runs, :failed_relationships)
   end
 end

db/migrate/20220301001839_create_bulkrax_pending_relationships.rb

@@ -1,11 +1,13 @@
 class CreateBulkraxPendingRelationships < ActiveRecord::Migration[5.2]
   def change
-    create_table :bulkrax_pending_relationships do |t|
-      t.belongs_to :bulkrax_importer_run, foreign_key: true, null: false
-      t.string :parent_id, null: false
-      t.string :child_id, null: false
+    unless table_exists?(:bulkrax_pending_relationships)
+      create_table :bulkrax_pending_relationships do |t|
+        t.belongs_to :bulkrax_importer_run, foreign_key: true, null: false
+        t.string :parent_id, null: false
+        t.string :child_id, null: false
 
-      t.timestamps
+        t.timestamps
+      end
     end
   end
 end

db/migrate/20220303212810_add_order_to_bulkrax_pending_relationships.rb

@@ -1,5 +1,5 @@
 class AddOrderToBulkraxPendingRelationships < ActiveRecord::Migration[5.2]
   def change
-    add_column :bulkrax_pending_relationships, :order, :integer, default: 0
+    add_column :bulkrax_pending_relationships, :order, :integer, default: 0 unless column_exists?(:bulkrax_pending_relationships, :order)
   end
 end