<aside> 👉 Links (Property base class)

</aside>

<aside> 💡

[P] means methods for Page Property, [DB/DS] means methods for Database or DataSource Property.

</aside>

1. Instance methods

UniqueIdProperty handles the Notion unique_id property. Page values are read-only. The auto-incremented number is assigned by Notion. Database / DataSource schema can set prefix.

[P/DB/DS] unique_id → Hash, nil

unique_id of Page property returns the unique ID Hash, including prefix and number.
unique_id of Database or DataSource property returns the schema Hash. When prefix is not set, it is an empty Hash {} or a Hash whose prefix is nil.
Page unique ID values cannot be updated. Page#save does not send this property unless will_update is true, and UniqueIdProperty has no Page setter that sets will_update.
```
page.properties["ID"].unique_id
# => {"prefix"=>"ST", "number"=>3}

ds.properties["ID"].unique_id
# => {}
```

[P/DB/DS] prefix → String, nil

prefix reads @json["prefix"].
Page property returns the prefix of the unique ID, or nil when it is not set.
Database / DataSource property returns the schema prefix, or nil when it is not set.
```
page.properties["ID"].prefix
# => "ST"

ds.properties["ID"].prefix
# => nil
```

[P/DB/DS] number → Integer, nil

number reads @json["number"].
Page property returns the auto-incremented number assigned by Notion.
Database / DataSource schema has no number, so this usually returns nil.

number cannot be set. Notion assigns it automatically.

page.properties["ID"].number
# => 3

ds.properties["ID"].number
# => nil

[DB/DS] prefix=(value) → String, nil

[PARAM] value new prefix (String), or nil

prefix= of Database / DataSource property sets the schema prefix and sets will_update to true.