Understanding Record Source Type setting in Basic Forms in Power Portal

Record Source Type setting is used to define how the information is passed to the form: There are 3 types of record source type can be used.

• Query String – This setting is default when you are creating a table form or a basic form in power portals Studio. When the page that contains the form is displayed, the record identifier is expected to be part of the query string from the URL, for example https://abc.powerappsportals.com/contacts/edit/?id=<contact guid>. Usually, this setting is done automatically when the form is linked to a table list. This setting is by far the most common. Usually we use id as querystring parameter.
• Current Portal User – This option is configured within the Portal Management model driven app. When this option is selected, the form will load the information from the current portal user record without using additional information from the page URL. Commonly, this option is used to render a user profile form. The Table Name column in this case must be set to Contact because portal users are represented by the contact table.
• Record Associated to Current Portal User – This option is configured within the Portal Management app. Selecting this option allows you to edit associated records, such as the current user’s parent account details. Relationship Name must be specified to identify the record to edit. The table type that is selected must match the selection in the Table Name column. This option is useful in partner scenarios where the partner organization would have multiple portal users. Some of these users could be authorized to edit the parent account record.

hope this help.

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