Fix integer out of range

lib/ajax-datatables-rails/datatable/column/search.rb

@@ -5,6 +5,9 @@ module Datatable
     class Column
       module Search
 
+        SMALLEST_PQ_INTEGER = -2147483648
+        LARGEST_PQ_INTEGER = 2147483647
+
         def searchable?
           @view_column.fetch(:searchable, true)
         end
@@ -49,12 +52,16 @@ def regex_search
           end
         end
 
+        def empty_search
+          casted_column.matches('')
+        end
+
         def non_regex_search
           case cond
           when Proc
             filter
           when :eq, :not_eq, :lt, :gt, :lteq, :gteq, :in
-            numeric_search
+            is_searchable_integer? ? numeric_search : empty_search
           when :null_value
             null_value_search
           when :start_with
@@ -82,6 +89,18 @@ def numeric_search
           end
         end
 
+        def is_searchable_integer?
+          return true unless table.respond_to?(:engine)
+          table.engine.columns_hash[field.to_s].sql_type == 'integer' && is_integer?(search.value) && !is_out_of_range?(search.value)
+        end
+
+        def is_out_of_range?(search_value)
+          Integer(search_value) > LARGEST_PQ_INTEGER || Integer(search_value) < SMALLEST_PQ_INTEGER
+        end
+
+        def is_integer?(string)
+          true if Integer(string) rescue false
+        end
       end
     end
   end

spec/ajax-datatables-rails/orm/active_record_filter_records_spec.rb

@@ -387,6 +387,32 @@
       end
     end
 
+    describe 'Integer overflows' do
+      let(:largest_postgresql_integer_value) { 2147483647 }
+      let(:smallest_postgresql_integer_value) { -2147483648 }
+
+      before(:each) do
+        create(:user, first_name: 'john', post_id: 1)
+        create(:user, first_name: 'mary', post_id: 2)
+        create(:user, first_name: 'phil', post_id: largest_postgresql_integer_value)
+      end
+
+      it 'Returns an empty result if input value is too large' do
+        datatable.params[:columns]['4'][:search][:value] = largest_postgresql_integer_value + 1
+        expect(datatable.data.size).to eq 0
+      end
+
+      it 'Returns an empty result if input value is too small' do
+        datatable.params[:columns]['4'][:search][:value] = smallest_postgresql_integer_value - 1
+        expect(datatable.data.size).to eq 0
+      end
+
+      it 'returns the matching user' do
+        datatable.params[:columns]['4'][:search][:value] = largest_postgresql_integer_value
+        expect(datatable.data.size).to eq 1
+      end
+    end
+
     describe 'it can filter records with condition :eq' do
       let(:datatable) { DatatableCondEq.new(view) }