SharePoint 2013 REST API Filter hidden Fields

Question

I have a little Problem. I'm trying to do the following. There is a Field on SharePoint List items called HasUniqueRoleAssignments that is hidden on a standard REST call. If I put it in the select string of the rest call I will retrieve it. So far so good. But what I apperently can't do is use it in the filter statement. So the URL

.../sites/site/_api/web/lists/getbytitle('Listname')/items?$filter=(Some_Standard_Field%20eq%20%27139%27)&$select=Id,HasUniqueRoleAssignments,Author/Title,Editor/Title,Created,Some_Standard_FieldId&$expand=Author,Editor&$top=1000

will work just fine. But if I try

.../sites/site/_api/web/lists/getbytitle('Listname')/items?$filter=(HasUniqueRoleAssignments%20eq%20%27false%27)&$select=Id,HasUniqueRoleAssignments&$top=1000

the request will fail with the error message, that the column HasUniqueRoleAssignments is not available.

Does anyone have an idea, how to use the filter to get items with

HasUniqueRoleAssignments = false or true?

Would be thankful for help

Answer 1

Try to use this endpoint:

.../sites/site/_api/web/lists/getbytitle('Listname')/items?$select=Id,HasUniqueRoleAssignments&$filter=HasUniqueRoleAssignments eq 0&$top=1000

?

Filtering a boolean field with 'false' means a string.

If you want filter true use: eq 1 instead of eq 'false'.

And false use: eq 0 instead of eq 'true'.