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Update map in loop

Section

order = %{
  "_csrf_token" => "gwsgw",
  "custom_tags" => "",
  "id" => "62212",
  "products" => %{
    "123456" => %{
      "category" => "3",
      "tag" => ["hero", "superstar"],
      "title" => "Product title"
    },
    "234567" => %{"category" => "5", "title" => "Product title"},
    "345678" => %{
      "category" => "8",
      "tag" => ["creation", "dynasty"],
      "title" => "Product title"
    },
    "456789" => %{
      "category" => "5",
      "title" => "Product title"
    }
  },
  "order_id" => "193885",
  "custom_message" => "Nothing to declare",
  "tags_title" => %{"tag" => ["preview"]},
  "allcats" => "5"
}
%{
  "_csrf_token" => "gwsgw",
  "allcats" => "5",
  "custom_message" => "Nothing to declare",
  "custom_tags" => "",
  "id" => "62212",
  "order_id" => "193885",
  "products" => %{
    "123456" => %{"category" => "3", "tag" => ["hero", "superstar"], "title" => "Product title"},
    "234567" => %{"category" => "5", "title" => "Product title"},
    "345678" => %{"category" => "8", "tag" => ["creation", "dynasty"], "title" => "Product title"},
    "456789" => %{"category" => "5", "title" => "Product title"}
  },
  "tags_title" => %{"tag" => ["preview"]}
}
associated_products = %{
  "123456" => [
    %{
      "id" => "4984944",
      "has_stock" => false,
      "name" => "Other product Name",
      "product_id" => "123456"
    },
    %{
      "id" => "3511064",
      "has_stock" => true,
      "name" => "Other product Name",
      "product_id" => "123456"
    }
  ],
  "234567" => [
    %{
      "id" => "3511075",
      "has_stock" => true,
      "name" => "Other product Name",
      "product_id" => "234567"
    },
    %{
      "id" => "3511076",
      "has_stock" => false,
      "name" => "Other product Name",
      "product_id" => "234567"
    }
  ],
  "345678" => [
    %{
      "id" => "3511082",
      "has_stock" => true,
      "name" => "Other product Name",
      "product_id" => "345678"
    },
    %{
      "id" => "3511083",
      "has_stock" => false,
      "name" => "Other product Name",
      "product_id" => "345678"
    }
  ]
}
%{
  "123456" => [
    %{
      "has_stock" => false,
      "id" => "4984944",
      "name" => "Other product Name",
      "product_id" => "123456"
    },
    %{
      "has_stock" => true,
      "id" => "3511064",
      "name" => "Other product Name",
      "product_id" => "123456"
    }
  ],
  "234567" => [
    %{
      "has_stock" => true,
      "id" => "3511075",
      "name" => "Other product Name",
      "product_id" => "234567"
    },
    %{
      "has_stock" => false,
      "id" => "3511076",
      "name" => "Other product Name",
      "product_id" => "234567"
    }
  ],
  "345678" => [
    %{
      "has_stock" => true,
      "id" => "3511082",
      "name" => "Other product Name",
      "product_id" => "345678"
    },
    %{
      "has_stock" => false,
      "id" => "3511083",
      "name" => "Other product Name",
      "product_id" => "345678"
    }
  ]
}
Enum.reduce(order["products"], order, fn {product_id, _product}, order ->
  associated =
    associated_products
    |> Map.values()
    |> List.flatten()
    |> Enum.filter(&(&1["product_id"] == product_id))

  update_in(order, ["products", product_id], fn product ->
    Map.put(product, "associated_products", associated)
  end)
end)
%{
  "_csrf_token" => "gwsgw",
  "allcats" => "5",
  "custom_message" => "Nothing to declare",
  "custom_tags" => "",
  "id" => "62212",
  "order_id" => "193885",
  "products" => %{
    "123456" => %{
      "associated_products" => [
        %{
          "has_stock" => false,
          "id" => "4984944",
          "name" => "Other product Name",
          "product_id" => "123456"
        },
        %{
          "has_stock" => true,
          "id" => "3511064",
          "name" => "Other product Name",
          "product_id" => "123456"
        }
      ],
      "category" => "3",
      "tag" => ["hero", "superstar"],
      "title" => "Product title"
    },
    "234567" => %{
      "associated_products" => [
        %{
          "has_stock" => true,
          "id" => "3511075",
          "name" => "Other product Name",
          "product_id" => "234567"
        },
        %{
          "has_stock" => false,
          "id" => "3511076",
          "name" => "Other product Name",
          "product_id" => "234567"
        }
      ],
      "category" => "5",
      "title" => "Product title"
    },
    "345678" => %{
      "associated_products" => [
        %{
          "has_stock" => true,
          "id" => "3511082",
          "name" => "Other product Name",
          "product_id" => "345678"
        },
        %{
          "has_stock" => false,
          "id" => "3511083",
          "name" => "Other product Name",
          "product_id" => "345678"
        }
      ],
      "category" => "8",
      "tag" => ["creation", "dynasty"],
      "title" => "Product title"
    },
    "456789" => %{"associated_products" => [], "category" => "5", "title" => "Product title"}
  },
  "tags_title" => %{"tag" => ["preview"]}
}
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