How to nest a list into a map?

israelcastilloh

Hey guys!

I have a single list like this:

[x, y, [1], [2] ... w, z, [3], [4] ... ]

My question is how could i recreate a map which assigns the first 2 as nested maps (or as keys) and the lists within the list as values of the nested maps. Such as it could be expressed as

[ key: x [ key: y, value: [1] [2] ] ]
[ key: w [ key: z value: [3] [4] ] ]

Where 1 and 2 belongs to y which belongs to x.
Where 3 and 4 belongs to z which belongs to w.

Does anyone have an idea how to do this in Elixir?

I am more knowledgeable on python dictionaries. So I was thinking on choosing those elements inside the first list that are “not-list” (x, w) an assign them as keys, and those inside a list (1,2) as values.

10 comments

#troubleshooting #algorithm #ecto_enum #list-of-nested-map-help

0 1020 10

2020-08-17 17:51:54 UTC

Marked As Solved

Show Best Posts
Show All (oldest first)
Show All (newest first)

NobbZ

That’s not JSON, that’s an elixir map.

It doesn’t imply any ordering of keys as well.

For small maps it might sometimes look like the keys are in order of insertion, but this is due to an implementation detail.

It is better to not assume any order in maps.

Post #10

Also Liked

fuelen

defmodule Test do
  def data do
    [
      "JUZGADO PRIMERO CIVIL DE ENSENADA, B.C. 30 DE JULIO DE 2020",
      "PRIMERA SECRETARIA",
      "Acuerdos",
      [
        "1",
        "00268/2016",
        "ROSARIO MEDA MONROY Y OTRAS    VS ANTONIETA GONZALEZ DE CROSTHWAITE TAMBIEN CONOCIDA COMO MARIA ANTONIETA GONZALEZ VIUDA DE CROSTHWAITE ORDINARIO CIVIL PRESCRIPCION POSITIVA"
      ],
      ["2", "00319/2017", "SUCESION INTESTAMENTARIA A BIENES DE, GABRIELA ACEVEDO AMADOR. SUCESORIO INTESTAMENTARIO"],
      [
        "3",
        "00570/2017",
        "SUCESION TESTAMENTARIA A BIENES DE GUADALUPE RIOS ARRIAGA, TAMBIEN CONOCIDA COMO MARIA GUADALUPE RIOS ARRIAGA    VS REGISTRO PUBLICO DE LA PROPIEDAD Y DE COMERCIO Y OTROS ORDINARIO CIVIL PRESCRIPCION POSITIVA"
      ],
      "one",
      "two",
      ["1", "date"],
      ["2", "date"]
    ]
  end

  def process(input, acc \\ %{}) do
    {keys, tail} = Enum.split_while(input, &is_binary/1)
    {values, tail} = Enum.split_while(tail, &is_list/1)
    acc = put_in(acc, Enum.map(keys, &Access.key(&1, %{})), values)

    case tail do
      [] -> acc
      _ -> process(tail, acc)
    end
  end
end

and output

> Test.process(Test.data())
%{
  "JUZGADO PRIMERO CIVIL DE ENSENADA, B.C. 30 DE JULIO DE 2020" => %{
    "PRIMERA SECRETARIA" => %{
      "Acuerdos" => [
        ["1", "00268/2016",
         "ROSARIO MEDA MONROY Y OTRAS    VS ANTONIETA GONZALEZ DE CROSTHWAITE TAMBIEN CONOCIDA COMO MARIA ANTONIETA GONZALEZ VIUDA DE CROSTHWAITE ORDINARIO CIVIL PRESCRIPCION POSITIVA"],
        ["2", "00319/2017",
         "SUCESION INTESTAMENTARIA A BIENES DE, GABRIELA ACEVEDO AMADOR. SUCESORIO INTESTAMENTARIO"],
        ["3", "00570/2017",
         "SUCESION TESTAMENTARIA A BIENES DE GUADALUPE RIOS ARRIAGA, TAMBIEN CONOCIDA COMO MARIA GUADALUPE RIOS ARRIAGA    VS REGISTRO PUBLICO DE LA PROPIEDAD Y DE COMERCIO Y OTROS ORDINARIO CIVIL PRESCRIPCION POSITIVA"]
      ]
    }
  },
  "one" => %{"two" => [["1", "date"], ["2", "date"]]}
}

Is this a structure you are looking for?

Post #5