Extracted from ShoppingList#list_items as refactor

shopping_list_item_mixin.rb

scope :without_removed, -> { where(arel_table[:removed].eq(nil).or(arel_table[:removed].eq(0))) }
scope :only_removed, -> { where(arel_table[:removed].not_eq(nil)).where(arel_table[:removed].not_eq(0)) }

def self.date_range start_date, end_date
  includes(:event).
    where(Event.arel_table[:event].gteq(start_date)).
    where(Event.arel_table[:event].lteq(end_date))
end

shopping_list_list_items_mixin.rb

    list_items = ShoppingListItems.where(user_id: current_user.id).include(:ingredients)
    list_items = list_items.date_range(start_date, end_date)
    list_items = list_items.without_removed if options[:hide_removed]