fix: resolve nil condition for es query (#83)

fix: fix up nil condition for ES query

Co-authored-by: Muhammad Luthfi Fahlevi <[email protected]>

Author: luthfifahlevi

pkg/queryexpr/es_expr.go

@@ -107,6 +107,9 @@ func (e ESExpr) binaryNodeToEsQuery(n *ast.BinaryNode) (interface{}, error) { //
 
 	case "==":
 		if leftStr, ok := left.(string); ok {
+			if right == nil {
+				return e.mustNotExistQuery(leftStr), nil
+			}
 			return e.termQuery(leftStr, right), nil
 		}
 		result, err := getQueryExprResult(n.String())
@@ -117,6 +120,9 @@ func (e ESExpr) binaryNodeToEsQuery(n *ast.BinaryNode) (interface{}, error) { //
 
 	case "!=":
 		if leftStr, ok := left.(string); ok {
+			if right == nil {
+				return e.mustExistQuery(leftStr), nil
+			}
 			return e.mustNotQuery(leftStr, right), nil
 		}
 		result, err := getQueryExprResult(n.String())
@@ -257,6 +263,30 @@ func (ESExpr) mustNotQuery(field string, value interface{}) map[string]interface
 	}
 }
 
+func (ESExpr) mustExistQuery(field string) map[string]interface{} {
+	return map[string]interface{}{
+		"bool": map[string]interface{}{
+			"must": map[string]interface{}{
+				"exists": map[string]interface{}{
+					"field": field,
+				},
+			},
+		},
+	}
+}
+
+func (ESExpr) mustNotExistQuery(field string) map[string]interface{} {
+	return map[string]interface{}{
+		"bool": map[string]interface{}{
+			"must_not": map[string]interface{}{
+				"exists": map[string]interface{}{
+					"field": field,
+				},
+			},
+		},
+	}
+}
+
 func (ESExpr) rangeQuery(field, operator string, value interface{}) map[string]interface{} {
 	return map[string]interface{}{
 		"range": map[string]interface{}{

pkg/queryexpr/es_expr_test.go

@@ -50,6 +50,24 @@ func TestESExpr_ToQuery(t *testing.T) {
 			want:    `{"query":{"range":{"updated_at":{"gt":"2024-04-05 23:59:59"}}}}`,
 			wantErr: false,
 		},
+		{
+			name:    "equals to nil",
+			expr:    queryexpr.ESExpr(`refreshed_at == nil`),
+			want:    `{"query":{"bool":{"must_not":{"exists":{"field":"refreshed_at"}}}}}`,
+			wantErr: false,
+		},
+		{
+			name:    "not equals to nil",
+			expr:    queryexpr.ESExpr(`refreshed_at != nil`),
+			want:    `{"query":{"bool":{"must":{"exists":{"field":"refreshed_at"}}}}}`,
+			wantErr: false,
+		},
+		{
+			name:    "equals to nil and not equal to nil",
+			expr:    queryexpr.ESExpr(`refreshed_at == nil && updated_at != nil`),
+			want:    `{"query":{"bool":{"must":[{"bool":{"must_not":{"exists":{"field":"refreshed_at"}}}},{"bool":{"must":{"exists":{"field":"updated_at"}}}}]}}}`,
+			wantErr: false,
+		},
 		{
 			name:    "in condition",
 			expr:    queryexpr.ESExpr(`service in ["test1","test2","test3"]`),