Power Apps - Patch function

Hello, new Post Today. We’re going to understand how to use Patch function with SharePoint list. For this Example I used a “Task List” who contains text , choose , lookup and numeric columns.

Let’s see “Patch” Function.

Syntax

Patch( DataSource, BaseRecord , ChangeRecord1 ,_ChangeRecord_2,…)

Parameters:

• Data source: the data source who contains your records. In our case is our SharePoint list.
• BaseRecord : the record to update or use Defaults to create new one.
• ChangeRecord(s): one or more record who contains properties to modify.

Pills:

• You can use Patch tu create new record or update existing record.
• Patch will update only specified properties, other will ignored.

Example

Here our task list:

Create new record:

Patch(
    Tasks,
    Defaults(Tasks),
    {
        Title: "New Task",
        Description: "Our task descriptions",
        Status: {Value: "New"},
        Project: {
            '@odata.type': "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference",
            Id: 1,
            Value: "Project 1"
        },
        ProjectID:1000
    }
)

Key points:

• Title and Descriptions are text field, so we should pass text value. Same for ProjectID who is Number and we must pass numeric value.
• For Choose value, function expect record: {Value: “New”}
• For Lookup column, we must pass record with ‘@odata.type’, Id and Value:

 '@odata.type': "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference",
            Id: 1,
            Value: "Project 1"
        }

That’s all! If we want to update an existing record? You must get it and pass to patch function instead Defaults(). In this case, I used Lookup function to retrieve record to update:

LookUp(Tasks,ID=4)

So, complete code is:

Patch(
    Tasks,
    LookUp(Tasks,ID=4),
    {
        Title: "Old Task",
        Description: "Our task descriptions",
        Status: {Value: "New"},
        Project: {
            '@odata.type': "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference",
            Id: 1,
            Value: "Project 1"
        },
        ProjectID:2000
    }
)

This is the official link of patch function.

I hope this post should help you.