Fix relation property config types

client_test.go

@@ -189,9 +189,12 @@ func TestFindDatabaseByID(t *testing.T) {
 								"type": "relation",
 								"relation": {
 									"database_id": "668d797c-76fa-4934-9b05-ad288df2d136",
+									"type": "dual_property",
+									"dual_property": {
 										"synced_property_name": "Related to Test database (Relation Test)",
 										"synced_property_id": "IJi<"
 									}
+								}
 							},
 							"Number of meals": {
 								"id": "Z\\Eh",
@@ -327,8 +330,11 @@ func TestFindDatabaseByID(t *testing.T) {
 						Type: notion.DBPropTypeRelation,
 						Relation: &notion.RelationMetadata{
 							DatabaseID: "668d797c-76fa-4934-9b05-ad288df2d136",
-							SyncedPropName: "Related to Test database (Relation Test)",
+							Type:       notion.RelationTypeDualProperty,
+							DualProperty: &notion.DualPropertyRelation{
 								SyncedPropID:   "IJi<",
+								SyncedPropName: "Related to Test database (Relation Test)",
+							},
 						},
 					},
 					"Number of meals": notion.DatabaseProperty{

database.go

@@ -42,8 +42,10 @@ type (
 	}
 	RelationMetadata struct {
 		DatabaseID string       `json:"database_id,omitempty"`
-		SyncedPropName string `json:"synced_property_name,omitempty"`
+		Type       RelationType `json:"type,omitempty"`
-		SyncedPropID   string `json:"synced_property_id,omitempty"`
+
+		SingleProperty *struct{}             `json:"single_property,omitempty"`
+		DualProperty   *DualPropertyRelation `json:"dual_property,omitempty"`
 	}
 	RollupMetadata struct {
 		RelationPropName string         `json:"relation_property_name,omitempty"`
@@ -54,7 +56,15 @@ type (
 	}
 )
 
-type RollupFunction string
+type DualPropertyRelation struct {
+	SyncedPropID   string `json:"synced_property_id,omitempty"`
+	SyncedPropName string `json:"synced_property_name,omitempty"`
+}
+
+type (
+	RollupFunction string
+	RelationType   string
+)
 
 const (
 	RollupFunctionCountAll          RollupFunction = "count_all"
@@ -71,6 +81,9 @@ const (
 	RollupFunctionMax               RollupFunction = "max"
 	RollupFunctionRange             RollupFunction = "range"
 	RollupFunctionShowOriginal      RollupFunction = "show_original"
+
+	RelationTypeSingleProperty RelationType = "single_property"
+	RelationTypeDualProperty   RelationType = "dual_property"
 )
 
 type SelectOptions struct {