Power BI DAX - adding date filter to DAX Query

Question

I am trying to add a date condition to the DAX query below, and I am struggling to find something to work. I basically want to filter on the Combination.Expiration Date column. For example, I dont want the query to return anything if there is no expiration date, or the expiration date is in the past. Below is the current DAX query.

List of Requirement values = 
VAR __DISTINCT_VALUES_COUNT = DISTINCTCOUNT('Combination'[Requirement])
VAR __MAX_VALUES_TO_SHOW = 90
RETURN
    IF(
        __DISTINCT_VALUES_COUNT > __MAX_VALUES_TO_SHOW,
        CONCATENATE(
            CONCATENATEX(
                TOPN(
                    __MAX_VALUES_TO_SHOW,
                    VALUES('Combination'[Requirement]),
                    'Combination'[Requirement],
                    ASC
                ),
                'Combination'[Requirement],
                ", ",
                'Combination'[Requirement],
                ASC
            ),
            ", etc."
        ),
        CONCATENATEX(
            VALUES('Combination'[Requirement]),
            'Combination'[Requirement],
            ", ",
            'Combination'[Requirement],
            ASC
        )
    )

Can somebody assist me in adding a date filter to this?

Answer 1

VALUES('Combination'[Requirement]) gives you a table with all the Requirement values in the Combination table.

If you want to exclude certain result from that table, you need to apply a filter to that table.

You have two options:

Option 1:
VAR tbl_values = CALCULATETABLE(VALUES('Combination'[Requirement]),
                'Combination'[Expiration Date] = BLANK() ||
                'Combination'[Expiration Date] < TODAY())

Option 2:
VAR tbl_filtered = FILTER('Combination', 
                'Combination'[Expiration Date] = BLANK() ||
                'Combination'[Expiration Date] < TODAY())

Then you can replace the VALUES in your measure

List of Requirement values = 
VAR __DISTINCT_VALUES_COUNT = DISTINCTCOUNT('Combination'[Requirement])
VAR __MAX_VALUES_TO_SHOW = 90
VAR tbl_filtered = FILTER('Combination', 
                'Combination'[Expiration Date] = BLANK() ||
                'Combination'[Expiration Date] < TODAY())

RETURN
    IF(
        __DISTINCT_VALUES_COUNT > __MAX_VALUES_TO_SHOW,
        CONCATENATE(
            CONCATENATEX(
                TOPN(
                    __MAX_VALUES_TO_SHOW,
                    tbl_filtered,
                    'Combination'[Requirement],
                    ASC
                ),
                'Combination'[Requirement],
                ", ",
                'Combination'[Requirement],
                ASC
            ),
            ", etc."
        ),
        CONCATENATEX(
            tbl_filtered,
            'Combination'[Requirement],
            ", ",
            'Combination'[Requirement],
            ASC
        )
    )

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