https://github.com/rubocop-hq/rails-style-guide

db/migrate/20120822100401_create_dmsf_workflows.rb

@@ -26,7 +26,7 @@ class CreateDmsfWorkflows < ActiveRecord::Migration
       t.string :name, null: false
       t.references :project    
     end
-    add_index :dmsf_workflows, [:name], unique: true, name: :index_dmsf_workflows_on_name
+    add_index :dmsf_workflows, [:name], unique: true
         
     change_table :dmsf_file_revisions do |t|
       t.references :dmsf_workflow

db/migrate/20120822100402_create_dmsf_workflow_steps.rb

@@ -27,7 +27,7 @@ class CreateDmsfWorkflowSteps < ActiveRecord::Migration
       t.references :user, null: false
       t.integer :operator, null: false
     end
-    add_index :dmsf_workflow_steps, :dmsf_workflow_id, name: :index_dmsf_workflow_steps_on_dmsf_workflow_id
+    add_index :dmsf_workflow_steps, :dmsf_workflow_id
   end
 
 end

db/migrate/20131108141401_add_index_to_dmsf_files.rb

@@ -21,7 +21,7 @@
 class AddIndexToDmsfFiles < ActiveRecord::Migration
 
   def change
-    add_index :dmsf_files, :project_id, name: :index_dmsf_files_on_project_id
+    add_index :dmsf_files, :project_id
   end
 
 end

db/migrate/20131108141402_add_index_to_dmsf_folders.rb

@@ -21,7 +21,7 @@
 class AddIndexToDmsfFolders < ActiveRecord::Migration
 
   def change
-    add_index :dmsf_folders, :project_id, name: :index_dmsf_folders_on_project_id
+    add_index :dmsf_folders, :project_id
   end
 
 end

db/migrate/20131113141401_add_index_to_dmsf_file_revision.rb

@@ -21,7 +21,7 @@
 class AddIndexToDmsfFileRevision < ActiveRecord::Migration
 
   def change
-    add_index :dmsf_file_revisions, :dmsf_file_id, name: :index_dmsf_file_revisions_on_dmsf_file_id
+    add_index :dmsf_file_revisions, :dmsf_file_id
   end
 
 end

db/migrate/20131113141402_add_index_to_dmsf_lock.rb

@@ -21,7 +21,7 @@
 class AddIndexToDmsfLock < ActiveRecord::Migration
 
   def change
-    add_index :dmsf_locks, :entity_id, name: :index_dmsf_locks_on_entity_id
+    add_index :dmsf_locks, :entity_id
   end
 
 end

db/migrate/20131113141403_create_dmsf_links.rb

@@ -32,7 +32,7 @@ class CreateDmsfLinks < ActiveRecord::Migration
       t.integer :deleted_by_user_id
       t.timestamps null: false
     end
-    add_index :dmsf_links, :project_id, name: :index_dmsf_links_on_project_id
+    add_index :dmsf_links, :project_id
   end
 
 end

db/migrate/20161223133200_create_dmsf_public_urls.rb

@@ -28,7 +28,7 @@ class CreateDmsfPublicUrls < ActiveRecord::Migration
       t.datetime :expire_at, null: false
       t.timestamps
     end
-    add_index :dmsf_public_urls, :token, name: :index_dmsf_public_urls_on_token
+    add_index :dmsf_public_urls, :token
   end
 
 end

db/migrate/20170118142001_dmsf_file_container.rb

@@ -26,14 +26,14 @@ class DmsfFileContainer < ActiveRecord::Migration
     add_column :dmsf_files, :container_type, :string, limit: 30, null: false,
                default: 'Project'
     DmsfFile.update_all container_type: 'Project'
-    add_index :dmsf_files, [:container_id, :container_type], name: :index_dmsf_files_on_container_id_container_type
+    add_index :dmsf_files, [:container_id, :container_type]
   end
 
   def down
     remove_index :dmsf_files, [:container_id, :container_type]
     remove_column :dmsf_files, :container_type
     rename_column :dmsf_files, :container_id, :project_id
-    add_index :dmsf_files, :project_id, name: :index_dmsf_files_on_project_id
+    add_index :dmsf_files, :project_id
   end
 
 end

db/migrate/20170330131901_create_dmsf_folder_permissions.rb

@@ -26,7 +26,7 @@ class CreateDmsfFolderPermissions < ActiveRecord::Migration
       t.integer :object_id, null: false
       t.string :object_type, limit: 30, null: false
     end
-    add_index :dmsf_folder_permissions, :dmsf_folder_id, name: :index_dmsf_folder_permissions_on_dmsf_folder_id
+    add_index :dmsf_folder_permissions, :dmsf_folder_id
   end
 
 end

db/migrate/20170421101901_dmsf_file_container_rollback.rb

@@ -63,7 +63,7 @@ class DmsfFileContainerRollback < ActiveRecord::Migration
     remove_index :dmsf_files, [:container_id, :container_type]
     remove_column :dmsf_files, :container_type
     rename_column :dmsf_files, :container_id, :project_id
-    add_index :dmsf_files, :project_id, name: :index_dmsf_files_on_project_id
+    add_index :dmsf_files, :project_id
     # Initialize system folder_flag to dmsf_folders
     DmsfFolder.where(id: new_folder_ids).update_all(system: true)
   end
@@ -88,7 +88,7 @@ class DmsfFileContainerRollback < ActiveRecord::Migration
       end
     end
     remove_column :dmsf_files, :project_id # temporarily added for the save method
-    add_index :dmsf_files, [:container_id, :container_type], name: :index_dmsf_files_on_container_id_container_type
+    add_index :dmsf_files, [:container_id, :container_type]
     # dmsf_folders
     DmsfFolder.where(system: true).delete_all
     remove_column :dmsf_folders, :system

db/migrate/20171110155901_add_index_to_dmsf_folder.rb

@@ -21,7 +21,7 @@
 class AddIndexToDmsfFolder < ActiveRecord::Migration
 
   def change
-    add_index :dmsf_folders, :dmsf_folder_id, name: :index_dmsf_folders_on_dmsf_folder_id
+    add_index :dmsf_folders, :dmsf_folder_id
   end
 
 end