How to Create a Dynamic Grid with Month-Year Columns Based on Date Range selection in Appian?

RE: How to Create a Dynamic Grid with Month-Year Columns Based on Date Range selection in Appian?

Stefan Helzle — Sat, 24 May 2025 04:45:15 GMT

You cannot display millions of anything in an Appian interface. This is not what Appian is made for.

But, as far as I understand, you do want to display only a small subset of it. Did you do an estimation of how much data you need to display?

Then, calling rule in a loop is no problem in general, while doing database queries in a loop is.

Did you consider using Process HQ to support this use case?

RE: How to Create a Dynamic Grid with Month-Year Columns Based on Date Range selection in Appian?

Shahid — Fri, 23 May 2025 17:33:58 GMT

Hi Stefan Helzle Thanks for the support so far!

I’ve made good progress — I’m able to:

✅ Generate all dates between the selected date range

✅ Display dynamic Month-Year columns in a grid

✅ Populate each cell with the correct ForecastAmount for its respective ActivityName and Month-Year, using an expression rule

However, I’m facing a performance issue now.

Since the dataset contains millions of records, and each cell in the Month-Year columns is calling an expression rule to get its value, the performance has become very slow.

My Question:

Is there a better or more efficient way to display these Month-Year forecast values without making individual rule calls for each cell?

Would it be better to:

Preprocess and pivot the data in a single rule before binding it to the grid?
Use a different design approach or plug-in to optimize performance?

Any suggestions or best practices for handling large datasets with dynamic grids would be really helpful.

RE: How to Create a Dynamic Grid with Month-Year Columns Based on Date Range selection in Appian?

Stefan Helzle — Fri, 23 May 2025 17:26:58 GMT

If you plan to use a normal read only grid, you can create any number of columns dynamically.

My approach to such tasks is, to first build a small prototype, assuring myself that I understand the challenge and I have solutions to all the tiny problems making up the whole thing.

E.g. to get the dynamic list of months, you can use code like this:

a!localVariables(
  local!start: today(),
  local!end: date(2026, 11, 15),
  local!numMonths: (12 * year(local!end) + month(local!end)) - (12 * year(local!start) + month(local!start)),
  local!months: a!forEach(
    items: enumerate(local!numMonths),
    expression: a!addDateTime(
      startDateTime: local!start,
      months: fv!item
    )
  ),
  local!months
)