PC-50: Fixed validation for formula to use regular expression

Author: PivtoranisV

app/models/item.rb

@@ -83,7 +83,7 @@ def calculation_formula_must_be_valid
 
   def check_all_formula_parameters_present
     missing_parameters = formula_parameters.reject do |param|
-      calculation_formula.include?(param)
+      calculation_formula.match?(/\b#{Regexp.escape(param)}\b/)
     end
 
     return unless missing_parameters.any?

spec/models/item_spec.rb

@@ -109,7 +109,7 @@
         end
 
         it 'is invalid if all formula_parameters are missing in formula' do
-          item.calculation_formula = 'param1 + 123'
+          item.calculation_formula = 'param1 + 123 + param212'
           expect(item).not_to be_valid
           expect(item.errors[:calculation_formula]).to include('is missing parameters: param2')
         end