Add "update page properties" endpoint support

client.go

@@ -186,3 +186,40 @@ func (c *Client) CreatePage(ctx context.Context, params CreatePageParams) (page
 
 	return page, nil
 }
+
+// UpdatePageProps updates page property values for a page.
+// See: https://developers.notion.com/reference/patch-page
+func (c *Client) UpdatePageProps(ctx context.Context, pageID string, params UpdatePageParams) (page Page, err error) {
+	if err := params.Validate(); err != nil {
+		return Page{}, fmt.Errorf("notion: invalid page params: %w", err)
+	}
+
+	body := &bytes.Buffer{}
+
+	err = json.NewEncoder(body).Encode(params)
+	if err != nil {
+		return Page{}, fmt.Errorf("notion: failed to encode body params to JSON: %w", err)
+	}
+
+	req, err := c.newRequest(ctx, http.MethodPatch, "/pages/"+pageID, body)
+	if err != nil {
+		return Page{}, fmt.Errorf("notion: invalid request: %w", err)
+	}
+
+	res, err := c.httpClient.Do(req)
+	if err != nil {
+		return Page{}, fmt.Errorf("notion: failed to make HTTP request: %w", err)
+	}
+	defer res.Body.Close()
+
+	if res.StatusCode != http.StatusOK {
+		return Page{}, fmt.Errorf("notion: failed to update page properties: %w", parseErrorResponse(res))
+	}
+
+	err = json.NewDecoder(res.Body).Decode(&page)
+	if err != nil {
+		return Page{}, fmt.Errorf("notion: failed to parse HTTP response: %w", err)
+	}
+
+	return page, nil
+}

database.go

@@ -29,35 +29,35 @@ type (
 		Expression string `json:"expression"`
 	}
 	RelationMetadata struct {
-		DatabaseID     string  `json:"database_id"`
-		SyncedPropName *string `json:"synced_property_name"`
-		SyncedPropID   *string `json:"synced_property_id"`
+		DatabaseID     string  `json:"database_id,omitempty"`
+		SyncedPropName *string `json:"synced_property_name,omitempty"`
+		SyncedPropID   *string `json:"synced_property_id,omitempty"`
 	}
 	RollupMetadata struct {
-		RelationPropName string `json:"relation_property_name"`
-		RelationPropID   string `json:"relation_property_id"`
-		RollupPropName   string `json:"rollup_property_name"`
-		RollupPropID     string `json:"rollup_property_id"`
-		Function         string `json:"function"`
+		RelationPropName string `json:"relation_property_name,omitempty"`
+		RelationPropID   string `json:"relation_property_id,omitempty"`
+		RollupPropName   string `json:"rollup_property_name,omitempty"`
+		RollupPropID     string `json:"rollup_property_id,omitempty"`
+		Function         string `json:"function,omitempty"`
 	}
 )
 
 type SelectOptions struct {
-	ID    string `json:"id"`
-	Name  string `json:"name"`
-	Color string `json:"color"`
+	ID    string `json:"id,omitempty"`
+	Name  string `json:"name,omitempty"`
+	Color Color  `json:"color,omitempty"`
 }
 
 type DatabaseProperty struct {
 	ID   string               `json:"id"`
 	Type DatabasePropertyType `json:"type"`
 
-	Number      *NumberMetadata   `json:"number"`
-	Select      *SelectMetadata   `json:"select"`
-	MultiSelect *SelectMetadata   `json:"multi_select"`
-	Formula     *FormulaMetadata  `json:"formula"`
-	Relation    *RelationMetadata `json:"relation"`
-	Rollup      *RollupMetadata   `json:"rollup"`
+	Number      *NumberMetadata   `json:"number,omitempty"`
+	Select      *SelectMetadata   `json:"select,omitempty"`
+	MultiSelect *SelectMetadata   `json:"multi_select,omitempty"`
+	Formula     *FormulaMetadata  `json:"formula,omitempty"`
+	Relation    *RelationMetadata `json:"relation,omitempty"`
+	Rollup      *RollupMetadata   `json:"rollup,omitempty"`
 }
 
 // DatabaseQuery is used for quering a database.

page.go

@@ -42,10 +42,16 @@ type PageTitle struct {
 type DatabasePageProperties map[string]DatabasePageProperty
 
 type DatabasePageProperty struct {
-	DatabaseProperty
-	RichText    []RichText      `json:"rich_text"`
-	Select      *SelectOptions  `json:"select"`
-	MultiSelect []SelectOptions `json:"multi_select"`
+	ID   string               `json:"id,omitempty"`
+	Type DatabasePropertyType `json:"type"`
+
+	RichText    []RichText        `json:"rich_text,omitempty"`
+	Number      *NumberMetadata   `json:"number,omitempty"`
+	Select      *SelectOptions    `json:"select,omitempty"`
+	MultiSelect []SelectOptions   `json:"multi_select,omitempty"`
+	Formula     *FormulaMetadata  `json:"formula,omitempty"`
+	Relation    *RelationMetadata `json:"relation,omitempty"`
+	Rollup      *RollupMetadata   `json:"rollup,omitempty"`
 }
 
 // CreatePageParams are the params used for creating a page.
@@ -61,6 +67,12 @@ type CreatePageParams struct {
 	Children []Block
 }
 
+type UpdatePageParams struct {
+	// Either DatabasePageProperties or Title must be not nil.
+	DatabasePageProperties *DatabasePageProperties
+	Title                  []RichText
+}
+
 type ParentType string
 
 const (
@@ -166,3 +178,28 @@ func (p *Page) UnmarshalJSON(b []byte) error {
 
 	return nil
 }
+
+func (p UpdatePageParams) Validate() error {
+	if p.DatabasePageProperties == nil && p.Title == nil {
+		return errors.New("either database page properties or title is required")
+	}
+	return nil
+}
+
+func (p UpdatePageParams) MarshalJSON() ([]byte, error) {
+	type UpdatePageParamsDTO struct {
+		Properties interface{} `json:"properties"`
+	}
+
+	var dto UpdatePageParamsDTO
+
+	if p.DatabasePageProperties != nil {
+		dto.Properties = p.DatabasePageProperties
+	} else if p.Title != nil {
+		dto.Properties = PageTitle{
+			Title: p.Title,
+		}
+	}
+
+	return json.Marshal(dto)
+}