How to write a csv in F#?

Question

How would I write a record in F# into a csv? It would be optimal to have one row for each instance of a certain variable. My record and final output is a map like the one below.

type Family =
    { Month : int
      Year : int
      Income : float
      Family : int
      Dogs : int
      Cats : int
    }

let monthly =
    timeMap
    |> Seq.ofList
    |> Seq.map(fun ((month,year), rows) ->
        { Month = month
          Year = year
          Income = rows.Inc
          Family = familyMap.[(month,year)].Children
          Dogs = familyMap.[(month,year)].Dogs
          Cats = familyMap.[(month,year)].Cats
        })
    |> List.ofSeq

let map = 
    monthly
    |> List.map (fun x -> (x.Year,x.Month),x)
    |> Map.ofList 

EDITED

This is what I have tried, but I am getting the error that (A,B,C,D,E,F) are not defined , and that it is recommended that I use the syntax new (type) args . This last error is showing up under >> MyCsvType

type MyCsvType = CsvProvider<Schema = "A (int), B (int), C (float), D (int), E (int), F (int)", HasHeaders = false>
let myCsvBuildRow (x:Family) = MyCsvType.Row(x.A,x.B,x.C,x.D,x.E,x.F)
let myCsvBuildTable = (Seq.map myCsvBuildRow) >> Seq.toList >> MyCsvType
let myCsv = monthly|> myCsvBuildTable
myCsv.SaveToString()

Answer 1

Your code is almost there, except that the myCsvBuildRow function needs to access members of the Family type using their correct names. In your version, you are accessing names such as A , B , etc., but those are the names of columns in your CSV file, not the names of members of the F# record. The following does the trick for me:

type MyCsvType = CsvProvider<Schema = "A (int), B (int), C (float), D (int), E (int), F (int)", HasHeaders = false>

let myCsvBuildRow (x:Family) = 
  MyCsvType.Row(x.Month,x.Year,x.Income,x.Family,x.Dogs,x.Cats)
let myCsvBuildTable data = 
  new MyCsvType(Seq.map myCsvBuildRow data)

let myCsv = family |> myCsvBuildTable
myCsv.SaveToString()