MDX passing variable as string to Item()

Question

I have my MDX query as follow:

with set SelectedEntity as '{Union({[Category].[Tertiary Category].Members}, {[Category].[Secondary Category].Members}).Item("Emails")}'
select Crossjoin({[Measures].[Reach]}, {[Age Group].[15-17], [Age Group].[18-24], [Age Group].[25-30], [Age Group].[31-35], [Age Group].[36-40], [Age Group].[40+]}) ON ROWS,
{[SelectedEntity]} ON COLUMNS
from [AppUsage]
where {[Country].[India]}*{[Date].[2011].[April]}*{[Panel].[Syndicate]}

Here in place of Item("Emails") I want pass a variable something like this Item(${category}). Hence my query should become something like this:

with set SelectedEntity as '{Union({[Category].[Tertiary Category].Members}, {[Category].[Secondary Category].Members}).Item(${category})}'
    select Crossjoin({[Measures].[Reach]}, {[Age Group].[15-17], [Age Group].[18-24], [Age Group].[25-30], [Age Group].[31-35], [Age Group].[36-40], [Age Group].[40+]}) ON ROWS,
    {[SelectedEntity]} ON COLUMNS
    from [AppUsage]
    where {[Country].[India]}*{[Date].[2011].[April]}*{[Panel].[Syndicate]}

But try to pass this category variable to this query it gives me error as Failed to parse the query.

I am not getting where am going wrong? Is this the correct way to pass a variable in Item() as it needs the string.

Note: ${category} variable value I am getting after selecting an entity into the Auto-complete field which I want to pass to the above query

EDIT:

When I pass the value 'Emails' for category variable in the query, i.e. in above Item(${category}), in logs the same query becomes Item(Emails). But instead of this it should be something like this: Item("Emails").

I need to know how do I pass this variable as a string in my mondrian MDX query.

Answer 1

I got the solution for this.

The variable needed to be passed as Item("${category}"). Hence my query will become:

with set SelectedEntity as '{Union({[Category].[Tertiary Category].Members}, {[Category].[Secondary Category].Members}).Item("${category}")}'
    select Crossjoin({[Measures].[Reach]}, {[Age Group].[15-17], [Age Group].[18-24], [Age Group].[25-30], [Age Group].[31-35], [Age Group].[36-40], [Age Group].[40+]}) ON ROWS,
    {[SelectedEntity]} ON COLUMNS
    from [AppUsage]
    where {[Country].[India]}*{[Date].[2011].[April]}*{[Panel].[Syndicate]}

where ${category} is my variable.