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MongoDB field is array, how do I iterate a list?

cgamiller

I am querying a MongoDB datasource that is returning a single document. It has numerous subdocuments and many of them have arrays.
 
When choosing a field with an array, I'd like to iterate over that array in a list or table and have the columns of the table be the fields of the array.
 
For example, the selected field is: application.features[]
 
The features array has "name" and "description" fields. I'd like a list of each of the feature names.
 
Since the dataset returns 1 document, it only has a single row. I've done some research and not sure how to proceed.
 
* Do I need to save the JSON string as a variable and use a scripted dataset to parse the JSON?
 
* Is there an easier way to do this without using a scripted dataset?
 
Thanks.

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Comments

mwilliams

If you're currently bringing in the array as a string, you could use a text control to parse this out into rows into an HTML table, though, I think I'd have to hear more from you. I'm also not sure how well this will work with your layout. A scripted data set might be the best way to go. You could also always log an enhancement request to allow for arrays to be split into rows within a data set.

cgamiller

Michael -- Thanks for responding. Appreciate your insight.
 
Could you help me understand how I might accomplish this? Your suggestion might be the perfect solution.
 
An example string that is returned is "["Feature1", "Feature2"]" which is a javascript array of strings. (If I choose the application.features[].names field).
 
Do I use javascript scripting in birt to parse the array as JSON and then write a loop? Any chance you can point me to an example?
 
I think perhaps this is within reach but I'm looking for how to start parsing this into a HTML table (or maybe even an unordered list).
 
Thanks.

mwilliams

I thought you were saying it would come in as a string that you needed to parse. I guess I misunderstood the first post. I've not really ever tried to bring in a list as there isn't a data type for it. Have you been able to use the object once you got it into BIRT?

rafex

Hi, when i create a dataset in Birt with mongodb I have a list, if a using this element in the Preview Result only see 1 row (my list have any register), this one rows show group for example:
["data 1","data 2","data 3"] in the same row,
 
I need show in three rows to mapping my report.
 
data 1
data 2
data 3
 
Next i need insert this data in table into birt report
 
Please help me to do it
 
Thanks