feat(filter): add "is in" filter (#518)

Author: olesyakorovina

app/services/forest_liana/filters_parser.rb

@@ -149,14 +149,20 @@ def parse_operator(operator)
 
     def parse_value(operator, value)
       case operator
-      when 'not', 'greater_than', 'less_than', 'not_equal', 'equal', 'before', 'after', 'in'
+      when 'not', 'greater_than', 'less_than', 'not_equal', 'equal', 'before', 'after'
         value
       when 'contains', 'not_contains'
         "%#{value}%"
       when 'starts_with'
         "#{value}%"
       when 'ends_with'
         "%#{value}"
+      when 'in'
+        if value.kind_of?(String)
+          value.split(',').map { |val| val.strip() }
+        else
+          value
+        end
       when 'present', 'blank'
       else
         raise_unknown_operator_error(operator)

spec/services/forest_liana/filters_parser_spec.rb

@@ -396,6 +396,8 @@ module ForestLiana
         it { expect(filter_parser.parse_value('present', nil)).to eq nil }
         it { expect(filter_parser.parse_value('equal', 'yes')).to eq 'yes' }
         it { expect(filter_parser.parse_value('blank', nil)).to eq nil }
+        it { expect(filter_parser.parse_value('in', 'yes,maybe   ,no  ')).to eq ['yes', 'maybe', 'no'] }
+        it { expect(filter_parser.parse_value('in', 123)).to eq 123 }
       end
 
       context 'on unknown operator' do