How to get obtain %{key: value} with list with nested map

Questions / Help
, ,
1

Hello… I have a output like

  %{
    "name" => "A",
    "price_per_unit_in_cents" => nil,
    "price_point_count" => 1,
    "prices" => [
      %{

        "quantity" => nil,
        "formatted_unit_price" => "$10.00",
        "c_quantity" => 1,
        "unit_price" => "10.0"
      }
    ],
    "pricing_scheme" => "per_unit",
  },
  %{
    "name" => "B",
    "price_per_unit_in_cents" => nil,
    "price_point_count" => 1,
    "prices" => [
      %{
        "quantity" => nil,
        "formatted_unit_price" => "$14.95",
        "c_quantity" => 1,
        "unit_price" => "14.95"
      }
    ],
    "pricing_scheme" => "per_unit",
  },
 %{
    "name" => "C",
    "price_per_unit_in_cents" => nil,
    "price_point_count" => 1,
    "prices" => [
      %{
        "quantity" => nil,
        "formatted_unit_price" => "$22.95",
        "c_quantity" => 1,
        "unit_price" => "22.95"
      }
    ],
    "pricing_scheme" => "per_unit",
  }

I want to loop through each map so that I can have final output as

  [
              %{formatted_unit_price: "$20.00"},
              %{formatted_unit_price: "$10.00"},
              %{formatted_unit_price: "$30.00"}
  ]

Can anyone help me??

2

If there is more than one entry in "prices", how do you want to handle that?

1 Like
3

“Prices” will always have one entry.

4

Why is it a list then? And named in plural form?

Anyway, you can use Enum.map/2 and a pattern match in the anonymous function then:

Enum.map(input, fn %{"prices" => [%{"formatted_unit_price" => fup}]} ->
  %{formatted_unit_price: fup}
end)
2 Likes
5

Okay… will change those names… Thank you again

6

If you change the structure, my pattern match won’t work anymore ;).

1 Like
7

Ah… Okay :grinning:…

8

Should be easy to adjust though, if you get how pattern matches work.

1 Like
9

Just trying to understand things better… :smiley:

10

Which things exactly? We are happy to help and explain!

Open a new topic if you feel its different enough from your current topic.

2 Likes
11

if your data is list of maps

[
  %{
    "name" => "A",
    "price_per_unit_in_cents" => nil,
    "price_point_count" => 1,
    "prices" => [
      %{
        "c_quantity" => 1,
        "formatted_unit_price" => "$10.00",
        "quantity" => nil,
        "unit_price" => "10.0"
      }
    ],
    "pricing_scheme" => "per_unit"
  },
  %{
    "name" => "B",
    "price_per_unit_in_cents" => nil,
    "price_point_count" => 1,
    "prices" => [
      %{
        "c_quantity" => 1,
        "formatted_unit_price" => "$14.95",
        "quantity" => nil,
        "unit_price" => "14.95"
      }
    ],
    "pricing_scheme" => "per_unit"
  },
  %{
    "name" => "C",
    "price_per_unit_in_cents" => nil,
    "price_point_count" => 1,
    "prices" => [
      %{
        "c_quantity" => 1,
        "formatted_unit_price" => "$22.95",
        "quantity" => nil,
        "unit_price" => "22.95"
      }
    ],
    "pricing_scheme" => "per_unit"
  }
]

Enum.each(d,fn(m)-> Map.get(m, "prices") |> Enum.each(fn %{"formatted_unit_price" => price } -> IO.inspect(%{"formatted_unit_price": price}) end) |> IO.inspect  end)
1 Like