how to pass array in expression rule

Question

I I want the result of this expression rule to be in the below format or the highlighted format in the editor. currently I am passing name and comment from one CDT ,now along with this 2 fields I need to pass the colleagues array with add array with in the colleague array. 
 I have created other new CDT for colleague array with id , typeid and addcolleague array in it ,how to call it in the expression rule to get the result in the below format . Please advise How can I get this result in the below format ,can someone please advise Expected RESULT a!toJson 
 ({ 
 "name": "string", "Comment": "string", Colleagues: { 
 { "TypeId": 1, addColleague: 
 { "email": "string", "displayName": "String", "eFlag": false, "dFlag": false, "ProviderID": 2, "idFromProvider": "string" } } } })

Mike Schmitt · Answer

In your screenshot, "ri!add" is not configured as an array (list), despite that being specifically what Stefan advised.

Mike Schmitt · Answer

The info you're providing is all super unclear. Please show us: 
 1) a screenshot of your actual incoming data (making sure we can understand where a CDT is an array of values or not) 2) a screenshot of your actual currently-configured expression rule, which you're trying to run and it isn't working 
 Just double checking here but do you know how to use a!forEach()? From the context of the code in your original post expression rule screenshot, it looks like you might not. I don't see a single reference to "fv!item" though, so it's making me prety doubtful. 
 e.g. 
 a!map(
 name: "some string from DB",
 comment: "some comment",
 
 translatedInputs: a!forEach(
 ri!testInput,
 a!map(
 email: fv!item.inputEmail,
 dName: fv!item.name,
 eFlag: false(),
 isActive: fv!item.activeFlag
 )
 )
)

Mike Schmitt · Answer

(and of course that entire thing can just be wrapped in a!toJson once you know it's working...)

Mike Schmitt · Answer

ZAINAB said: Instead of [ ] , I need { } 
 The [ ] here are because the structure of your code indicates that the "CAC" property will contain an array, since you use curly brackets and then a!map(). If it's just supposed to contain a single sub-dictionary then you don't need to double-indicate this - meaning you could just pass in an a!map() call, OR the curly brackets - when you use both, it assumes that the property contains an array of (one of) that map. 
 This is what I get when I comment out just one of those: