Appease the dog overlords

app/controllers/ajax/list_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Ajax::ListController < AjaxController
   before_action :authenticate_user!
 
@@ -6,13 +8,13 @@ class Ajax::ListController < AjaxController
 
     @response[:status] = :err
 
-    target_user = User.find_by_screen_name!(params[:user])
+    target_user = User.find_by!(screen_name: params[:user])
     list = List.create! user: current_user, display_name: params[:name]
 
     @response[:status] = :okay
     @response[:success] = true
     @response[:message] = t(".success")
-    @response[:render] = render_to_string(partial: 'modal/list/item', locals: { list: list, user: target_user })
+    @response[:render] = render_to_string(partial: "modal/list/item", locals: { list: list, user: target_user })
   end
 
   def destroy
@@ -34,20 +36,20 @@ class Ajax::ListController < AjaxController
 
     @response[:status] = :err
 
-    add = params[:add] == 'true'
+    add = params[:add] == "true"
 
-    target_user = User.find_by_screen_name!(params[:user])
-    list = current_user.lists.find_by_name!(params[:list])
+    target_user = User.find_by!(screen_name: params[:user])
+    list = current_user.lists.find_by!(name: params[:list])
 
     raise Errors::ListingSelfBlockedOther if current_user.blocking?(target_user)
     raise Errors::ListingOtherBlockedSelf if target_user.blocking?(current_user)
 
     if add
-      list.add_member target_user if list.members.find_by_user_id(target_user.id).nil?
+      list.add_member target_user if list.members.find_by(user_id: target_user.id).nil?
       @response[:checked] = true
       @response[:message] = t(".success.add")
     else
-      list.remove_member target_user unless list.members.find_by_user_id(target_user.id).nil?
+      list.remove_member target_user unless list.members.find_by(user_id: target_user.id).nil?
       @response[:checked] = false
       @response[:message] = t(".success.remove")
     end

app/models/list.rb

@@ -12,9 +12,9 @@ class List < ApplicationRecord
   validates :display_name, length: { maximum: 30 }
 
   before_validation do
-    self.display_name.strip!
-    self.name = self.display_name.parameterize
-    self.name = '-followers-' if self.name == 'followers'
+    display_name.strip!
+    self.name = display_name.parameterize
+    self.name = "-followers-" if name == "followers"
   end
 
   alias members list_members