Update

app/models/shift_sale.rb

@@ -16,11 +16,17 @@ class ShiftSale < ApplicationRecord
   belongs_to :cashier_terminal
   belongs_to :employee, :foreign_key => 'employee_id'
 
+  def self.current_shift
+    today_date = DateTime.now.strftime("%Y-%m-%d")
+    shift = ShiftSale.where("DATE(shift_started_at)=? and shift_started_at is not null and shift_closed_at is null",today_date).take
+    return shift
+  end
+
   def self.current_open_shift(current_user)
     #if current_user
       #find open shift where is open today and is not closed and login by current cashier
       today_date = DateTime.now.strftime("%Y-%m-%d")
-      shift = ShiftSale.where("DATE(shift_started_at)= #{ today_date } and shift_started_at is not null and shift_closed_at is null and employee_id = #{current_user}").take
+      shift = ShiftSale.where("DATE(shift_started_at)=? and shift_started_at is not null and shift_closed_at is null and employee_id = #{current_user}",today_date).take
       return shift
     #end
   end