Create blank record type with all fields initialised

Question

With CDTs I can do something like this to initialise a CDT with all fields set to blank/null cast(
 'type!{urn:com:appian:types}CustomType',
 {}
) 
 Is anyone aware of a similar approach with records? Casting {}, null(), or a!map() to a record type just returns null 
 In this use case I won't know the field names to be able to use them. I only have the record type 
 **Edit: Adding more context 
 If the record type has fields A, B and c then each of those fields needs to be set with null/blank (which is what would happen with the CDT). 
 eg the value returned is recordType!CustomType(a: null, b: null, c: null)

Shubham Aware · Accepted Answer

Got you! There's no direct equivalent for Record Types. Unlike CDTs, you cannot initialize a record type with all fields set to null without knowing field names. If you want to set fields explicitly, you must do it field-by-field like this: recordType!Employee(
 name: "",
 age: null,
 email: ""
)

Harsha Sharma · Answer

You are correct! To work with local variables of record type we need to reference record fields using reference everywhere needed. 
 nathanp119 said: In this use case I won't know the field names to be able to use them. I only have the record type 
 Typing in recordtype!recordName.fields.... is the only way to know the field names and use with local variables indexing. 
 I personally try to work as much as possible with rule inputs instead of local variables Or, call a reusable constructor rule instead of ad-hoc expressions wherever needed!

Harsha Sharma · Answer

If I understood the requirements correctly, the function a!keys() can help you dynamically get the fields from record. Using the output you can match the keys with payload keys. Here is a sample expression for reference. 
 a!localVariables(
 local!recordData: a!queryRecordType(
 recordType: recordType!recordName,
 pagingInfo: a!pagingInfo(1, 1),
 fields: a!selectionFields(
 allFieldsFromRecordType: recordType!recordName,
 includeRealTimeCustomFields: true(),
 includeExtraLongTextFields: true(),
 selectFields: recordtype!relatedRecordFields
 )
 ).data,
 a!keys(local!recordData[1])
)

Create blank record type with all fields initialised

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