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Track Column Changes Flow

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Posted on by mg1308

Hi everyone, I have got a flow that supposed to grab the previous column's values and track its changes. I followed the guide based on this video Power Automate SharePoint Item Modified flow | Track Column Changes (Version History) - YouTube.
My Send an HTTP Request to SharePoint action output is grabbing the results correctly of modified and

field_x005f_8 (see figure 1); however, when I get to Append to Array variable with my apply to each action,

field_x005f_8 is blank (see figure 2) and Modified is showing (see figure 3). The expression I am using for the Value is

coalesce(body('Send_an_HTTP_request_to_SharePoint')?['d']?['results']?[0]?[item()], ''). Can you please help?

Update: I noticed that the Send_an_HTTP_request_to_SharePoint action changes the field name of the Select - Column Names action from field_8 to field_x005f_8 (see figure 1 and 4), why is that? Select - Column Names action is before the Send_an_HTTP_request_to_SharePoint action.

Figure 1 Send_an_HTTP_request_to_SharePoint

Figure 2 Append To Array result 1

Figure 3 Append To Array result 2

Figure 4 Select - Column Names

Thanks!

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Building flows

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Expiscornovus 33,189 Most Valuable Professional on at

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Hi @mg1308,

The underscore character gets encoded in the ColumnHasChanged array in the Get changes for an item or file action. So the _ in field_8 gets encoded to _x005f_ which makes it field_x005F_8

(HEX 005F, https://www.w3schools.com/charsets/ref_utf_basic_latin.asp)

In the below thread I tried to workaround that by using the internalname of the field instead:

https://powerusers.microsoft.com/t5/Building-Flows/Expression-Not-Valid-Power-Automate-SharePoint-Item-Modified/m-p/1770536/highlight/true#M195765

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mg1308 21 on at

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Hi @Expiscornovus
Thank you so much for your response! I was able to grab the correct name by creating another Send an HTTP request to SharePoint action named it as Send an HTTP request to SharePoint action - GetInternalName but my value part in my Append to variable is still blank, my expression is
coalesce(body('Send_an_HTTP_request_to_SharePoint')?['d']?['results']?[0]?[item()], ''). Please see screenshot below:

Here is also a screenshot of my whole flow:

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Expiscornovus 33,189 Most Valuable Professional on at

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Hi @mg1308,

Can you share a screenshot of the configuration of the Send an HTTP request to SharePoint action. Interested to see what Uri and Headers you are using in that action.

I would expect this type of URI:

_api/web/lists/getbytitle('Documents')/items(<itemid, for example 18>)/versions?$filter=VersionLabel eq '<versionlabel, for example 1.0>'&$select=@{join(body('Select_ColumnNames'),',')}

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mg1308 21 on at

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Hi @Expiscornovus

Here is my expression for the first Send an HTTP request to SharePoint:
_api/web/lists/GetByTitle('Emp List')/items(@{triggerOutputs()?['body/ID']})/versions?$filter=VersionLabel eq '@{sub(decimal(triggerOutputs()?['body/{VersionNumber}']), 1)}' &$select=@{join(body('Select_-_Column_Names'), ',')}

I did a sub expression to get the previous record.

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mg1308 21 on at

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Hi I have fixed the issue i have just changed the select - column names action map section to replace(item()?['ColumnName'], 'field_', 'field_x005f_'). Instead of using a second Send an HTTP request to SharePoint. This seemed to work and pick up the previous changes. This works considering the field names in the select action has to match with Send an HTTP request to Sharepoint field names to show results.

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