Fix incorrect types for Formula, Relation and Rollup page props

Fixes #11

client_test.go

@@ -471,6 +471,41 @@ func TestQueryDatabase(t *testing.T) {
 												"href": null
 											}
 										]
+									},
+									"Age": {
+										"id": "$9nb",
+										"type": "number",
+										"number": 42
+									},
+									"Calculation": {
+										"id": "s(4f",
+										"type": "formula",
+										"formula": {
+											"type": "number",
+											"number": 42
+										}
+									},
+									"Relation": {
+										"id": "Cxl[",
+										"type": "relation",
+										"relation": [
+											{
+												"id": "2be9597f-693f-4b87-baf9-efc545d38ebe"
+											}
+										]
+									},
+									"Rollup": {
+										"id": "xyA}",
+										"type": "rollup",
+										"rollup": {
+											"type": "array",
+											"array": [
+												{
+													"type": "number",
+													"number": 42
+												}
+											]
+										}
 									}
 								}
 							}
@@ -536,6 +571,41 @@ func TestQueryDatabase(t *testing.T) {
 									},
 								},
 							},
+							"Age": notion.DatabasePageProperty{
+								ID:     "$9nb",
+								Type:   notion.DBPropTypeNumber,
+								Number: notion.Float64Ptr(42),
+							},
+							"Calculation": notion.DatabasePageProperty{
+								ID:   "s(4f",
+								Type: notion.DBPropTypeFormula,
+								Formula: &notion.FormulaResult{
+									Type:   notion.FormulaResultTypeNumber,
+									Number: notion.Float64Ptr(float64(42)),
+								},
+							},
+							"Relation": notion.DatabasePageProperty{
+								ID:   "Cxl[",
+								Type: notion.DBPropTypeRelation,
+								Relation: []notion.Relation{
+									{
+										ID: "2be9597f-693f-4b87-baf9-efc545d38ebe",
+									},
+								},
+							},
+							"Rollup": notion.DatabasePageProperty{
+								ID:   "xyA}",
+								Type: notion.DBPropTypeRollup,
+								Rollup: &notion.RollupResult{
+									Type: notion.RollupResultTypeArray,
+									Array: []notion.DatabasePageProperty{
+										{
+											Type:   notion.DBPropTypeNumber,
+											Number: notion.Float64Ptr(42),
+										},
+									},
+								},
+							},
 						},
 					},
 				},

database.go

@@ -48,6 +48,27 @@ type SelectOptions struct {
 	Color Color  `json:"color,omitempty"`
 }
 
+type FormulaResult struct {
+	Type FormulaResultType `json:"type"`
+
+	String  *string  `json:"string,omitempty"`
+	Number  *float64 `json:"number,omitempty"`
+	Boolean *bool    `json:"boolean,omitempty"`
+	Date    *Date    `json:"date,omitempty"`
+}
+
+type Relation struct {
+	ID string `json:"id"`
+}
+
+type RollupResult struct {
+	Type RollupResultType `json:"type"`
+
+	Number *float64               `json:"number,omitempty"`
+	Date   *Date                  `json:"date,omitempty"`
+	Array  []DatabasePageProperty `json:"array,omitempty"`
+}
+
 type DatabaseProperty struct {
 	ID   string               `json:"id"`
 	Type DatabasePropertyType `json:"type"`
@@ -186,6 +207,8 @@ type DatabaseQuerySort struct {
 type (
 	DatabasePropertyType string
 	NumberFormat         string
+	FormulaResultType    string
+	RollupResultType     string
 	SortTimestamp        string
 	SortDirection        string
 )
@@ -225,6 +248,17 @@ const (
 	NumberFormatWon              NumberFormat = "won"
 	NumberformatYuan             NumberFormat = "yuan"
 
+	// Formula result type enums.
+	FormulaResultTypeString  FormulaResultType = "string"
+	FormulaResultTypeNumber  FormulaResultType = "number"
+	FormulaResultTypeBoolean FormulaResultType = "boolean"
+	FormulaResultTypeDate    FormulaResultType = "date"
+
+	// Rollup result type enums.
+	RollupResultTypeNumber RollupResultType = "number"
+	RollupResultTypeDate   RollupResultType = "date"
+	RollupResultTypeArray  RollupResultType = "array"
+
 	// Sort timestamp enums.
 	SortTimeStampCreatedTime    SortTimestamp = "created_time"
 	SortTimeStampLastEditedTime SortTimestamp = "last_edited_time"
@@ -254,3 +288,33 @@ func (prop DatabaseProperty) Metadata() interface{} {
 		return nil
 	}
 }
+
+// Value returns the underlying result value of an evaluated formula.
+func (f FormulaResult) Value() interface{} {
+	switch f.Type {
+	case FormulaResultTypeString:
+		return f.String
+	case FormulaResultTypeNumber:
+		return f.Number
+	case FormulaResultTypeBoolean:
+		return f.Boolean
+	case FormulaResultTypeDate:
+		return f.Date
+	default:
+		return nil
+	}
+}
+
+// Value returns the underlying result value of an evaluated rollup.
+func (r RollupResult) Value() interface{} {
+	switch r.Type {
+	case RollupResultTypeNumber:
+		return r.Number
+	case RollupResultTypeDate:
+		return r.Date
+	case RollupResultTypeArray:
+		return r.Array
+	default:
+		return nil
+	}
+}

page.go

@@ -47,13 +47,13 @@ type DatabasePageProperty struct {
 
 	Title       []RichText      `json:"title,omitempty"`
 	RichText    []RichText      `json:"rich_text,omitempty"`
-	Number      *NumberMetadata   `json:"number,omitempty"`
+	Number      *float64        `json:"number,omitempty"`
 	Select      *SelectOptions  `json:"select,omitempty"`
 	MultiSelect []SelectOptions `json:"multi_select,omitempty"`
 	Date        *Date           `json:"date,omitempty"`
-	Formula     *FormulaMetadata  `json:"formula,omitempty"`
-	Relation    *RelationMetadata `json:"relation,omitempty"`
-	Rollup      *RollupMetadata   `json:"rollup,omitempty"`
+	Formula     *FormulaResult  `json:"formula,omitempty"`
+	Relation    []Relation      `json:"relation,omitempty"`
+	Rollup      *RollupResult   `json:"rollup,omitempty"`
 }
 
 // CreatePageParams are the params used for creating a page.

util.go

@@ -21,3 +21,8 @@ func BoolPtr(b bool) *bool {
 func TimePtr(t time.Time) *time.Time {
 	return &t
 }
+
+// Float64Ptr returns the pointer of a float64 value.
+func Float64Ptr(f float64) *float64 {
+	return &f
+}