Add push update operator

README.md

@@ -200,13 +200,15 @@ Assuming that the `City` field in the `UserModel` struct is of type `string` and
 
 When you specify the query like `ByAge`, it finds documents that contains age value **equal to** the provided parameter value. However, there are other types of comparators provided for you to use as follows.
 
-- `Not`: The value in the document is not equal to the provided parameter value.
+| Keyword            | Meaning         | Sample                               |
-- `LessThan`: The value in the document is less than the provided parameter value.
+|--------------------|-----------------|--------------------------------------|
-- `LessThanEqual`: The value in the document is less than or equal to the provided parameter value.
+| -                  | == $1           | `FindByUsername(ctx, $1)`            |
-- `GreaterThan`: The value in the document is greater than the provided parameter value.
+| `LessThan`         | < $1            | `FindByAgeLessThan(ctx, $1)`         |
-- `GreaterThanEqual`: The value in the document is greater than of equal to the provided parameter value.
+| `LessThanEqual`    | <= $1           | `FindByAgeLessThanEqual(ctx, $1)`    |
-- `Between`: The value in the document is between two provided parameter values (inclusive).
+| `GreaterThan`      | > $1            | `FindByAgeGreaterThan(ctx, $1)`      |
-- `In`: The value in the document is in the provided parameter value (which is a slice).
+| `GreaterThanEqual` | >= $1           | `FindByAgeGreaterThanEqual(ctx, $1)` |
+| `Between`          | >= $1 and <= $2 | `FindByAgeBetween(ctx, $1, $2)`      |
+| `In`               | in slice $1     | `FindByCityIn(ctx, $1)`              |
 
 To apply these comparators to the query, place these words after the field name such as `ByAgeGreaterThan`. You can also use comparators along with `And` and `Or` operators. For example, `ByGenderNotOrAgeLessThan` will apply `Not` comparator to the `Gender` field and `LessThan` comparator to the `Age` field.
 

internal/code/extractor_test.go

@@ -277,7 +277,7 @@ type UserRepository interface {
 			file := code.ExtractComponents(f)
 
 			if !reflect.DeepEqual(file, testCase.ExpectedOutput) {
-				t.Errorf("Expected = %v\nReceived = %v", testCase.ExpectedOutput, file)
+				t.Errorf("Expected = %+v\nReceived = %+v", testCase.ExpectedOutput, file)
 			}
 		})
 	}

internal/code/models_test.go

@@ -24,7 +24,7 @@ func TestStructsByName(t *testing.T) {
 			t.Fail()
 		}
 		if !reflect.DeepEqual(structModel, userStruct) {
-			t.Errorf("Expected = %v\nReceived = %v", userStruct, structModel)
+			t.Errorf("Expected = %+v\nReceived = %+v", userStruct, structModel)
 		}
 	})
 
@@ -49,7 +49,7 @@ func TestStructFieldsByName(t *testing.T) {
 			t.Fail()
 		}
 		if !reflect.DeepEqual(field, usernameField) {
-			t.Errorf("Expected = %v\nReceived = %v", usernameField, field)
+			t.Errorf("Expected = %+v\nReceived = %+v", usernameField, field)
 		}
 	})
 
@@ -73,7 +73,7 @@ func TestInterfacesByName(t *testing.T) {
 			t.Fail()
 		}
 		if !reflect.DeepEqual(intf, userRepoIntf) {
-			t.Errorf("Expected = %v\nReceived = %v", userRepoIntf, intf)
+			t.Errorf("Expected = %+v\nReceived = %+v", userRepoIntf, intf)
 		}
 	})
 
@@ -121,7 +121,7 @@ func TestArrayTypeCode(t *testing.T) {
 			code := testCase.Type.Code()
 
 			if code != testCase.ExpectedCode {
-				t.Errorf("Expected = %v\nReceived = %v", testCase.ExpectedCode, code)
+				t.Errorf("Expected = %+v\nReceived = %+v", testCase.ExpectedCode, code)
 			}
 		})
 	}

internal/mongo/errors.go

@@ -44,3 +44,16 @@ type updateTypeNotSupportedError struct {
 func (err updateTypeNotSupportedError) Error() string {
 	return fmt.Sprintf("update type %s not supported", err.Update.Name())
 }
+
+// NewUpdateOperatorNotSupportedError creates updateOperatorNotSupportedError
+func NewUpdateOperatorNotSupportedError(operator spec.UpdateOperator) error {
+	return updateOperatorNotSupportedError{Operator: operator}
+}
+
+type updateOperatorNotSupportedError struct {
+	Operator spec.UpdateOperator
+}
+
+func (err updateOperatorNotSupportedError) Error() string {
+	return fmt.Sprintf("update operator %s not supported", err.Operator)
+}

internal/mongo/errors_test.go

@@ -4,6 +4,7 @@ import (
 	"testing"
 
 	"github.com/sunboyy/repogen/internal/mongo"
+	"github.com/sunboyy/repogen/internal/spec"
 )
 
 type ErrorTestCase struct {
@@ -40,12 +41,17 @@ func TestError(t *testing.T) {
 			Error:          mongo.NewUpdateTypeNotSupportedError(StubUpdate{}),
 			ExpectedString: "update type Stub not supported",
 		},
+		{
+			Name:           "UpdateOperatorNotSupportedError",
+			Error:          mongo.NewUpdateOperatorNotSupportedError(spec.UpdateOperator("STUB")),
+			ExpectedString: "update operator STUB not supported",
+		},
 	}
 
 	for _, testCase := range testTable {
 		t.Run(testCase.Name, func(t *testing.T) {
 			if testCase.Error.Error() != testCase.ExpectedString {
-				t.Errorf("Expected = %v\nReceived = %v", testCase.ExpectedString, testCase.Error.Error())
+				t.Errorf("Expected = %+v\nReceived = %+v", testCase.ExpectedString, testCase.Error.Error())
 			}
 		})
 	}

internal/mongo/generator.go

@@ -167,13 +167,22 @@ func (g RepositoryGenerator) getMongoUpdate(updateSpec spec.Update) (update, err
 	case spec.UpdateModel:
 		return updateModel{}, nil
 	case spec.UpdateFields:
-		var update updateFields
+		update := make(updateFields)
 		for _, field := range updateSpec {
 			bsonFieldReference, err := g.bsonFieldReference(field.FieldReference)
 			if err != nil {
 				return querySpec{}, err
 			}
-			update.Fields = append(update.Fields, updateField{BsonTag: bsonFieldReference, ParamIndex: field.ParamIndex})
+
+			updateKey := getUpdateOperatorKey(field.Operator)
+			if updateKey == "" {
+				return querySpec{}, NewUpdateOperatorNotSupportedError(field.Operator)
+			}
+			updateField := updateField{
+				BsonTag:    bsonFieldReference,
+				ParamIndex: field.ParamIndex,
+			}
+			update[updateKey] = append(update[updateKey], updateField)
 		}
 		return update, nil
 	default:
@@ -181,6 +190,17 @@ func (g RepositoryGenerator) getMongoUpdate(updateSpec spec.Update) (update, err
 	}
 }
 
+func getUpdateOperatorKey(operator spec.UpdateOperator) string {
+	switch operator {
+	case spec.UpdateOperatorSet:
+		return "$set"
+	case spec.UpdateOperatorPush:
+		return "$push"
+	default:
+		return ""
+	}
+}
+
 func (g RepositoryGenerator) generateDeleteImplementation(operation spec.DeleteOperation) (string, error) {
 	querySpec, err := g.mongoQuerySpec(operation.Query)
 	if err != nil {

internal/mongo/generator_test.go

@@ -31,6 +31,11 @@ var (
 		Type: code.SimpleType("NameModel"),
 		Tags: map[string][]string{"bson": {"name"}},
 	}
+	consentHistoryField = code.StructField{
+		Name: "ConsentHistory",
+		Type: code.ArrayType{ContainedType: code.SimpleType("ConsentHistory")},
+		Tags: map[string][]string{"bson": {"consent_history"}},
+	}
 	enabledField = code.StructField{
 		Name: "Enabled",
 		Type: code.SimpleType("bool"),
@@ -60,6 +65,7 @@ var userModel = code.Struct{
 		genderField,
 		ageField,
 		nameField,
+		consentHistoryField,
 		enabledField,
 		accessTokenField,
 	},
@@ -983,7 +989,7 @@ func (r *UserRepositoryMongo) UpdateByID(arg0 context.Context, arg1 *UserModel,
 				},
 				Operation: spec.UpdateOperation{
 					Update: spec.UpdateFields{
-						{FieldReference: spec.FieldReference{ageField}, ParamIndex: 1},
+						{FieldReference: spec.FieldReference{ageField}, ParamIndex: 1, Operator: spec.UpdateOperatorSet},
 					},
 					Mode: spec.QueryModeOne,
 					Query: spec.QuerySpec{
@@ -1024,7 +1030,7 @@ func (r *UserRepositoryMongo) UpdateAgeByID(arg0 context.Context, arg1 int, arg2
 				},
 				Operation: spec.UpdateOperation{
 					Update: spec.UpdateFields{
-						{FieldReference: spec.FieldReference{ageField}, ParamIndex: 1},
+						{FieldReference: spec.FieldReference{ageField}, ParamIndex: 1, Operator: spec.UpdateOperatorSet},
 					},
 					Mode: spec.QueryModeMany,
 					Query: spec.QuerySpec{
@@ -1048,6 +1054,93 @@ func (r *UserRepositoryMongo) UpdateAgeByGender(arg0 context.Context, arg1 int,
 	}
 	return int(result.MatchedCount), err
 }
+`,
+		},
+		{
+			Name: "simple update push method",
+			MethodSpec: spec.MethodSpec{
+				Name: "UpdateConsentHistoryPushByID",
+				Params: []code.Param{
+					{Name: "ctx", Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+					{Name: "consentHistory", Type: code.SimpleType("ConsentHistory")},
+					{Name: "gender", Type: code.ExternalType{PackageAlias: "primitive", Name: "ObjectID"}},
+				},
+				Returns: []code.Type{
+					code.SimpleType("bool"),
+					code.SimpleType("error"),
+				},
+				Operation: spec.UpdateOperation{
+					Update: spec.UpdateFields{
+						{FieldReference: spec.FieldReference{consentHistoryField}, ParamIndex: 1, Operator: spec.UpdateOperatorPush},
+					},
+					Mode: spec.QueryModeOne,
+					Query: spec.QuerySpec{
+						Predicates: []spec.Predicate{
+							{FieldReference: spec.FieldReference{idField}, Comparator: spec.ComparatorEqual, ParamIndex: 2},
+						},
+					},
+				},
+			},
+			ExpectedCode: `
+func (r *UserRepositoryMongo) UpdateConsentHistoryPushByID(arg0 context.Context, arg1 ConsentHistory, arg2 primitive.ObjectID) (bool, error) {
+	result, err := r.collection.UpdateOne(arg0, bson.M{
+		"_id": arg2,
+	}, bson.M{
+		"$push": bson.M{
+			"consent_history": arg1,
+		},
+	})
+	if err != nil {
+		return false, err
+	}
+	return result.MatchedCount > 0, err
+}
+`,
+		},
+		{
+			Name: "simple update set and push method",
+			MethodSpec: spec.MethodSpec{
+				Name: "UpdateEnabledAndConsentHistoryPushByID",
+				Params: []code.Param{
+					{Name: "ctx", Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+					{Name: "enabled", Type: code.SimpleType("bool")},
+					{Name: "consentHistory", Type: code.SimpleType("ConsentHistory")},
+					{Name: "gender", Type: code.ExternalType{PackageAlias: "primitive", Name: "ObjectID"}},
+				},
+				Returns: []code.Type{
+					code.SimpleType("bool"),
+					code.SimpleType("error"),
+				},
+				Operation: spec.UpdateOperation{
+					Update: spec.UpdateFields{
+						{FieldReference: spec.FieldReference{enabledField}, ParamIndex: 1, Operator: spec.UpdateOperatorSet},
+						{FieldReference: spec.FieldReference{consentHistoryField}, ParamIndex: 2, Operator: spec.UpdateOperatorPush},
+					},
+					Mode: spec.QueryModeOne,
+					Query: spec.QuerySpec{
+						Predicates: []spec.Predicate{
+							{FieldReference: spec.FieldReference{idField}, Comparator: spec.ComparatorEqual, ParamIndex: 3},
+						},
+					},
+				},
+			},
+			ExpectedCode: `
+func (r *UserRepositoryMongo) UpdateEnabledAndConsentHistoryPushByID(arg0 context.Context, arg1 bool, arg2 ConsentHistory, arg3 primitive.ObjectID) (bool, error) {
+	result, err := r.collection.UpdateOne(arg0, bson.M{
+		"_id": arg3,
+	}, bson.M{
+		"$set": bson.M{
+			"enabled": arg1,
+		},
+		"$push": bson.M{
+			"consent_history": arg2,
+		},
+	})
+	if err != nil {
+		return false, err
+	}
+	return result.MatchedCount > 0, err
+}
 `,
 		},
 		{
@@ -1065,7 +1158,7 @@ func (r *UserRepositoryMongo) UpdateAgeByGender(arg0 context.Context, arg1 int,
 				},
 				Operation: spec.UpdateOperation{
 					Update: spec.UpdateFields{
-						{FieldReference: spec.FieldReference{nameField, firstNameField}, ParamIndex: 1},
+						{FieldReference: spec.FieldReference{nameField, firstNameField}, ParamIndex: 1, Operator: spec.UpdateOperatorSet},
 					},
 					Mode: spec.QueryModeOne,
 					Query: spec.QuerySpec{
@@ -1947,7 +2040,7 @@ func TestGenerateMethod_Invalid(t *testing.T) {
 				},
 				Operation: spec.UpdateOperation{
 					Update: spec.UpdateFields{
-						{FieldReference: spec.FieldReference{accessTokenField}, ParamIndex: 1},
+						{FieldReference: spec.FieldReference{accessTokenField}, ParamIndex: 1, Operator: spec.UpdateOperatorSet},
 					},
 					Mode: spec.QueryModeOne,
 					Query: spec.QuerySpec{
@@ -1984,6 +2077,33 @@ func TestGenerateMethod_Invalid(t *testing.T) {
 			},
 			ExpectedError: mongo.NewUpdateTypeNotSupportedError(StubUpdate{}),
 		},
+		{
+			Name: "update operator not supported",
+			Method: spec.MethodSpec{
+				Name: "UpdateConsentHistoryAppendByID",
+				Params: []code.Param{
+					{Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+					{Type: code.SimpleType("int")},
+					{Type: code.ExternalType{PackageAlias: "primitive", Name: "ObjectID"}},
+				},
+				Returns: []code.Type{
+					code.SimpleType("bool"),
+					code.SimpleType("error"),
+				},
+				Operation: spec.UpdateOperation{
+					Update: spec.UpdateFields{
+						{FieldReference: spec.FieldReference{consentHistoryField}, ParamIndex: 1, Operator: "APPEND"},
+					},
+					Mode: spec.QueryModeOne,
+					Query: spec.QuerySpec{
+						Predicates: []spec.Predicate{
+							{FieldReference: spec.FieldReference{idField}, Comparator: spec.ComparatorEqual, ParamIndex: 2},
+						},
+					},
+				},
+			},
+			ExpectedError: mongo.NewUpdateOperatorNotSupportedError("APPEND"),
+		},
 	}
 
 	for _, testCase := range testTable {
@@ -1994,7 +2114,7 @@ func TestGenerateMethod_Invalid(t *testing.T) {
 			err := generator.GenerateMethod(testCase.Method, buffer)
 
 			if err != testCase.ExpectedError {
-				t.Errorf("\nExpected = %v\nReceived = %v", testCase.ExpectedError, err)
+				t.Errorf("\nExpected = %+v\nReceived = %+v", testCase.ExpectedError, err)
 			}
 		})
 	}

internal/mongo/models.go

@@ -23,16 +23,19 @@ func (u updateModel) Code() string {
 	return `		"$set": arg1,`
 }
 
-type updateFields struct {
+type updateFields map[string][]updateField
-	Fields []updateField
-}
 
 func (u updateFields) Code() string {
-	lines := []string{`		"$set": bson.M{`}
+	var lines []string
-	for _, field := range u.Fields {
+	for k, v := range u {
+		lines = append(lines, fmt.Sprintf(`		"%s": bson.M{`, k))
+
+		for _, field := range v {
 			lines = append(lines, fmt.Sprintf(`			"%s": arg%d,`, field.BsonTag, field.ParamIndex))
 		}
+
 		lines = append(lines, `		},`)
+	}
 	return strings.Join(lines, "\n")
 }
 

internal/spec/errors.go

@@ -19,9 +19,11 @@ func (err ParsingError) Error() string {
 	case InvalidParamError:
 		return "parameters do not match the query"
 	case InvalidUpdateFieldsError:
-		return "update fields is invalid"
+		return "update fields are invalid"
 	case ContextParamRequiredError:
 		return "context parameter is required"
+	case PushNonArrayError:
+		return "cannot use push operation in a non-array type"
 	}
 	return string(err)
 }
@@ -33,6 +35,7 @@ const (
 	InvalidParamError         ParsingError = "ERROR_INVALID_PARAM"
 	InvalidUpdateFieldsError  ParsingError = "ERROR_INVALID_UPDATE_FIELDS"
 	ContextParamRequiredError ParsingError = "ERROR_CONTEXT_PARAM_REQUIRED"
+	PushNonArrayError         ParsingError = "ERROR_PUSH_NON_ARRAY"
 )
 
 // NewInvalidQueryError creates invalidQueryError

internal/spec/errors_test.go

@@ -48,7 +48,7 @@ func TestError(t *testing.T) {
 	for _, testCase := range testTable {
 		t.Run(testCase.Name, func(t *testing.T) {
 			if testCase.Error.Error() != testCase.ExpectedString {
-				t.Errorf("Expected = %v\nReceived = %v", testCase.ExpectedString, testCase.Error.Error())
+				t.Errorf("Expected = %+v\nReceived = %+v", testCase.ExpectedString, testCase.Error.Error())
 			}
 		})
 	}

internal/spec/models_test.go

@@ -38,7 +38,7 @@ func TestOperationName(t *testing.T) {
 	for _, testCase := range testTable {
 		t.Run(testCase.ExpectedName, func(t *testing.T) {
 			if testCase.Operation.Name() != testCase.ExpectedName {
-				t.Errorf("Expected = %v\nReceived = %v", testCase.ExpectedName, testCase.Operation.Name())
+				t.Errorf("Expected = %+v\nReceived = %+v", testCase.ExpectedName, testCase.Operation.Name())
 			}
 		})
 	}

internal/spec/parser_test.go

@@ -49,6 +49,10 @@ var (
 		Name: "Enabled",
 		Type: code.SimpleType("bool"),
 	}
+	consentHistoryField = code.StructField{
+		Name: "ConsentHistory",
+		Type: code.ArrayType{ContainedType: code.SimpleType("ConsentHistoryItem")},
+	}
 
 	firstNameField = code.StructField{
 		Name: "First",
@@ -81,6 +85,7 @@ var (
 			contactField,
 			referrerField,
 			defaultPaymentField,
+			consentHistoryField,
 			enabledField,
 		},
 	}
@@ -149,7 +154,7 @@ func TestParseInterfaceMethod_Insert(t *testing.T) {
 				Operation: testCase.ExpectedOperation,
 			}
 			if !reflect.DeepEqual(actualSpec, expectedOutput) {
-				t.Errorf("Expected = %v\nReceived = %v", expectedOutput, actualSpec)
+				t.Errorf("Expected = %+v\nReceived = %+v", expectedOutput, actualSpec)
 			}
 		})
 	}
@@ -654,7 +659,7 @@ func TestParseInterfaceMethod_Find(t *testing.T) {
 				Operation: testCase.ExpectedOperation,
 			}
 			if !reflect.DeepEqual(actualSpec, expectedOutput) {
-				t.Errorf("Expected = %v\nReceived = %v", expectedOutput, actualSpec)
+				t.Errorf("Expected = %+v\nReceived = %+v", expectedOutput, actualSpec)
 			}
 		})
 	}
@@ -700,7 +705,7 @@ func TestParseInterfaceMethod_Update(t *testing.T) {
 			},
 			ExpectedOperation: spec.UpdateOperation{
 				Update: spec.UpdateFields{
-					{FieldReference: spec.FieldReference{genderField}, ParamIndex: 1},
+					{FieldReference: spec.FieldReference{genderField}, ParamIndex: 1, Operator: spec.UpdateOperatorSet},
 				},
 				Mode: spec.QueryModeOne,
 				Query: spec.QuerySpec{Predicates: []spec.Predicate{
@@ -724,7 +729,7 @@ func TestParseInterfaceMethod_Update(t *testing.T) {
 			},
 			ExpectedOperation: spec.UpdateOperation{
 				Update: spec.UpdateFields{
-					{FieldReference: spec.FieldReference{genderField}, ParamIndex: 1},
+					{FieldReference: spec.FieldReference{genderField}, ParamIndex: 1, Operator: spec.UpdateOperatorSet},
 				},
 				Mode: spec.QueryModeMany,
 				Query: spec.QuerySpec{Predicates: []spec.Predicate{
@@ -748,7 +753,7 @@ func TestParseInterfaceMethod_Update(t *testing.T) {
 			},
 			ExpectedOperation: spec.UpdateOperation{
 				Update: spec.UpdateFields{
-					{FieldReference: spec.FieldReference{nameField, firstNameField}, ParamIndex: 1},
+					{FieldReference: spec.FieldReference{nameField, firstNameField}, ParamIndex: 1, Operator: spec.UpdateOperatorSet},
 				},
 				Mode: spec.QueryModeOne,
 				Query: spec.QuerySpec{Predicates: []spec.Predicate{
@@ -773,8 +778,58 @@ func TestParseInterfaceMethod_Update(t *testing.T) {
 			},
 			ExpectedOperation: spec.UpdateOperation{
 				Update: spec.UpdateFields{
-					{FieldReference: spec.FieldReference{genderField}, ParamIndex: 1},
+					{FieldReference: spec.FieldReference{genderField}, ParamIndex: 1, Operator: spec.UpdateOperatorSet},
-					{FieldReference: spec.FieldReference{cityField}, ParamIndex: 2},
+					{FieldReference: spec.FieldReference{cityField}, ParamIndex: 2, Operator: spec.UpdateOperatorSet},
+				},
+				Mode: spec.QueryModeMany,
+				Query: spec.QuerySpec{Predicates: []spec.Predicate{
+					{FieldReference: spec.FieldReference{idField}, Comparator: spec.ComparatorEqual, ParamIndex: 3},
+				}},
+			},
+		},
+		{
+			Name: "UpdateArgPushByArg method",
+			Method: code.Method{
+				Name: "UpdateConsentHistoryPushByID",
+				Params: []code.Param{
+					{Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+					{Type: code.SimpleType("ConsentHistoryItem")},
+					{Type: code.ExternalType{PackageAlias: "primitive", Name: "ObjectID"}},
+				},
+				Returns: []code.Type{
+					code.SimpleType("int"),
+					code.SimpleType("error"),
+				},
+			},
+			ExpectedOperation: spec.UpdateOperation{
+				Update: spec.UpdateFields{
+					{FieldReference: spec.FieldReference{consentHistoryField}, ParamIndex: 1, Operator: spec.UpdateOperatorPush},
+				},
+				Mode: spec.QueryModeMany,
+				Query: spec.QuerySpec{Predicates: []spec.Predicate{
+					{FieldReference: spec.FieldReference{idField}, Comparator: spec.ComparatorEqual, ParamIndex: 2},
+				}},
+			},
+		},
+		{
+			Name: "UpdateArgAndArgPushByArg method",
+			Method: code.Method{
+				Name: "UpdateEnabledAndConsentHistoryPushByID",
+				Params: []code.Param{
+					{Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+					{Type: code.SimpleType("bool")},
+					{Type: code.SimpleType("ConsentHistoryItem")},
+					{Type: code.ExternalType{PackageAlias: "primitive", Name: "ObjectID"}},
+				},
+				Returns: []code.Type{
+					code.SimpleType("int"),
+					code.SimpleType("error"),
+				},
+			},
+			ExpectedOperation: spec.UpdateOperation{
+				Update: spec.UpdateFields{
+					{FieldReference: spec.FieldReference{enabledField}, ParamIndex: 1, Operator: spec.UpdateOperatorSet},
+					{FieldReference: spec.FieldReference{consentHistoryField}, ParamIndex: 2, Operator: spec.UpdateOperatorPush},
 				},
 				Mode: spec.QueryModeMany,
 				Query: spec.QuerySpec{Predicates: []spec.Predicate{
@@ -798,7 +853,7 @@ func TestParseInterfaceMethod_Update(t *testing.T) {
 				Operation: testCase.ExpectedOperation,
 			}
 			if !reflect.DeepEqual(actualSpec, expectedOutput) {
-				t.Errorf("Expected = %v\nReceived = %v", expectedOutput, actualSpec)
+				t.Errorf("Expected = %+v\nReceived = %+v", expectedOutput, actualSpec)
 			}
 		})
 	}
@@ -1089,7 +1144,7 @@ func TestParseInterfaceMethod_Delete(t *testing.T) {
 				Operation: testCase.ExpectedOperation,
 			}
 			if !reflect.DeepEqual(actualSpec, expectedOutput) {
-				t.Errorf("Expected = %v\nReceived = %v", expectedOutput, actualSpec)
+				t.Errorf("Expected = %+v\nReceived = %+v", expectedOutput, actualSpec)
 			}
 		})
 	}
@@ -1150,7 +1205,7 @@ func TestParseInterfaceMethod_Count(t *testing.T) {
 				Operation: testCase.ExpectedOperation,
 			}
 			if !reflect.DeepEqual(actualSpec, expectedOutput) {
-				t.Errorf("Expected = %v\nReceived = %v", expectedOutput, actualSpec)
+				t.Errorf("Expected = %+v\nReceived = %+v", expectedOutput, actualSpec)
 			}
 		})
 	}
@@ -1169,7 +1224,7 @@ func TestParseInterfaceMethod_Invalid(t *testing.T) {
 
 	expectedError := spec.NewUnknownOperationError("Search")
 	if err != expectedError {
-		t.Errorf("\nExpected = %v\nReceived = %v", expectedError, err)
+		t.Errorf("\nExpected = %+v\nReceived = %+v", expectedError, err)
 	}
 }
 
@@ -1275,7 +1330,7 @@ func TestParseInterfaceMethod_Insert_Invalid(t *testing.T) {
 			_, err := spec.ParseInterfaceMethod(structs, structModel, testCase.Method)
 
 			if err != testCase.ExpectedError {
-				t.Errorf("\nExpected = %v\nReceived = %v", testCase.ExpectedError, err)
+				t.Errorf("\nExpected = %+v\nReceived = %+v", testCase.ExpectedError, err)
 			}
 		})
 	}
@@ -1577,7 +1632,7 @@ func TestParseInterfaceMethod_Find_Invalid(t *testing.T) {
 			_, err := spec.ParseInterfaceMethod(structs, structModel, testCase.Method)
 
 			if err.Error() != testCase.ExpectedError.Error() {
-				t.Errorf("\nExpected = %v\nReceived = %v", testCase.ExpectedError.Error(), err.Error())
+				t.Errorf("\nExpected = %+v\nReceived = %+v", testCase.ExpectedError.Error(), err.Error())
 			}
 		})
 	}
@@ -1647,6 +1702,22 @@ func TestParseInterfaceMethod_Update_Invalid(t *testing.T) {
 			},
 			ExpectedError: spec.InvalidUpdateFieldsError,
 		},
+		{
+			Name: "push operator in non-array field",
+			Method: code.Method{
+				Name: "UpdateGenderPushByID",
+				Params: []code.Param{
+					{Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+					{Type: code.SimpleType("Gender")},
+					{Type: code.ExternalType{PackageAlias: "primitive", Name: "ObjectID"}},
+				},
+				Returns: []code.Type{
+					code.SimpleType("bool"),
+					code.SimpleType("error"),
+				},
+			},
+			ExpectedError: spec.PushNonArrayError,
+		},
 		{
 			Name: "update method without query",
 			Method: code.Method{
@@ -1677,6 +1748,37 @@ func TestParseInterfaceMethod_Update_Invalid(t *testing.T) {
 			},
 			ExpectedError: spec.NewInvalidQueryError([]string{"ID", "And", "Username", "Or", "Gender"}),
 		},
+		{
+			Name: "parameters for push operator is not array's contained type",
+			Method: code.Method{
+				Name: "UpdateConsentHistoryPushByID",
+				Params: []code.Param{
+					{Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+					{Type: code.ArrayType{ContainedType: code.SimpleType("ConsentHistoryItem")}},
+					{Type: code.ExternalType{PackageAlias: "primitive", Name: "ObjectID"}},
+				},
+				Returns: []code.Type{
+					code.SimpleType("int"),
+					code.SimpleType("error"),
+				},
+			},
+			ExpectedError: spec.InvalidUpdateFieldsError,
+		},
+		{
+			Name: "insufficient function parameters",
+			Method: code.Method{
+				Name: "UpdateEnabledAll",
+				Params: []code.Param{
+					{Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+					// {Type: code.SimpleType("Enabled")},
+				},
+				Returns: []code.Type{
+					code.SimpleType("int"),
+					code.SimpleType("error"),
+				},
+			},
+			ExpectedError: spec.InvalidUpdateFieldsError,
+		},
 		{
 			Name: "update model with invalid parameter",
 			Method: code.Method{
@@ -1762,7 +1864,7 @@ func TestParseInterfaceMethod_Update_Invalid(t *testing.T) {
 			_, err := spec.ParseInterfaceMethod(structs, structModel, testCase.Method)
 
 			if err != testCase.ExpectedError {
-				t.Errorf("\nExpected = %v\nReceived = %v", testCase.ExpectedError, err)
+				t.Errorf("\nExpected = %+v\nReceived = %+v", testCase.ExpectedError, err)
 			}
 		})
 	}
@@ -1941,7 +2043,7 @@ func TestParseInterfaceMethod_Delete_Invalid(t *testing.T) {
 			_, err := spec.ParseInterfaceMethod(structs, structModel, testCase.Method)
 
 			if err != testCase.ExpectedError {
-				t.Errorf("\nExpected = %v\nReceived = %v", testCase.ExpectedError, err)
+				t.Errorf("\nExpected = %+v\nReceived = %+v", testCase.ExpectedError, err)
 			}
 		})
 	}
@@ -2072,7 +2174,7 @@ func TestParseInterfaceMethod_Count_Invalid(t *testing.T) {
 			_, err := spec.ParseInterfaceMethod(structs, structModel, testCase.Method)
 
 			if err != testCase.ExpectedError {
-				t.Errorf("\nExpected = %v\nReceived = %v", testCase.ExpectedError, err)
+				t.Errorf("\nExpected = %+v\nReceived = %+v", testCase.ExpectedError, err)
 			}
 		})
 	}

internal/spec/update.go

@@ -51,6 +51,35 @@ func (u UpdateFields) NumberOfArguments() int {
 type UpdateField struct {
 	FieldReference FieldReference
 	ParamIndex     int
+	Operator       UpdateOperator
+}
+
+// UpdateOperator is a custom type that declares update operator to be used in an update operation
+type UpdateOperator string
+
+// UpdateOperator constants
+const (
+	UpdateOperatorSet  UpdateOperator = "SET"
+	UpdateOperatorPush UpdateOperator = "PUSH"
+)
+
+// NumberOfArguments returns number of arguments required to perform an update operation
+func (o UpdateOperator) NumberOfArguments() int {
+	return 1
+}
+
+// ArgumentType returns type that is required for function parameter
+func (o UpdateOperator) ArgumentType(fieldType code.Type) (code.Type, error) {
+	switch o {
+	case UpdateOperatorPush:
+		arrayType, ok := fieldType.(code.ArrayType)
+		if !ok {
+			return nil, PushNonArrayError
+		}
+		return arrayType.ContainedType, nil
+	default:
+		return fieldType, nil
+	}
 }
 
 func (p interfaceMethodParser) parseUpdateOperation(tokens []string) (Operation, error) {
@@ -104,24 +133,51 @@ func (p interfaceMethodParser) parseUpdate(tokens []string) (Update, error) {
 
 	paramIndex := 1
 	for _, updateFieldToken := range updateFieldTokens {
-		updateFieldReference, ok := p.fieldResolver.ResolveStructField(p.StructModel, updateFieldToken)
+		updateField, err := p.parseUpdateField(updateFieldToken, paramIndex)
-		if !ok {
+		if err != nil {
-			return nil, NewStructFieldNotFoundError(updateFieldToken)
+			return nil, err
 		}
 
-		updateFields = append(updateFields, UpdateField{
+		updateFields = append(updateFields, updateField)
-			FieldReference: updateFieldReference,
+		paramIndex += updateField.Operator.NumberOfArguments()
-			ParamIndex:     paramIndex,
-		})
-		paramIndex++
 	}
 
 	for _, field := range updateFields {
-		if len(p.Method.Params) <= field.ParamIndex ||
+		if len(p.Method.Params) < field.ParamIndex+field.Operator.NumberOfArguments() {
-			field.FieldReference.ReferencedField().Type != p.Method.Params[field.ParamIndex].Type {
 			return nil, InvalidUpdateFieldsError
 		}
+
+		requiredType, err := field.Operator.ArgumentType(field.FieldReference.ReferencedField().Type)
+		if err != nil {
+			return nil, err
+		}
+
+		for i := 0; i < field.Operator.NumberOfArguments(); i++ {
+			if requiredType != p.Method.Params[field.ParamIndex+i].Type {
+				return nil, InvalidUpdateFieldsError
+			}
+		}
 	}
 
 	return updateFields, nil
 }
+
+func (p interfaceMethodParser) parseUpdateField(t []string, paramIndex int) (UpdateField, error) {
+	if len(t) > 1 && t[len(t)-1] == "Push" {
+		return p.createUpdateField(t[:len(t)-1], UpdateOperatorPush, paramIndex)
+	}
+	return p.createUpdateField(t, UpdateOperatorSet, paramIndex)
+}
+
+func (p interfaceMethodParser) createUpdateField(t []string, operator UpdateOperator, paramIndex int) (UpdateField, error) {
+	fieldReference, ok := p.fieldResolver.ResolveStructField(p.StructModel, t)
+	if !ok {
+		return UpdateField{}, NewStructFieldNotFoundError(t)
+	}
+
+	return UpdateField{
+		FieldReference: fieldReference,
+		ParamIndex:     paramIndex,
+		Operator:       operator,
+	}, nil
+}

internal/spec/update_test.go

@@ -26,7 +26,7 @@ func TestUpdateTypeName(t *testing.T) {
 	for _, testCase := range testTable {
 		t.Run(testCase.ExpectedName, func(t *testing.T) {
 			if testCase.Update.Name() != testCase.ExpectedName {
-				t.Errorf("Expected = %v\nReceived = %v", testCase.ExpectedName, testCase.Update.Name())
+				t.Errorf("Expected = %+v\nReceived = %+v", testCase.ExpectedName, testCase.Update.Name())
 			}
 		})
 	}