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Get data from previous changeset

I have the set of data for airports tickets:

%{
  class: "economy",
  legs: [
    %{date: "2018-08-01", from: ["FRA"], to: ["LON"]},
    %{date: "2018-08-10", from: ["LON"], to: ["FRA"]}
  ],
  passengers: %{adults: 1, children: 0, infants: 0}
}

I am using cast_assoc for legs:

...
|> cast(attrs, [:passengers, :class])
|> cast_assoc(:legs)
...

I need to check that the dates in the right order (date of first flight needs to be before the date of second flight). How can I get the value of date previous changeset?

Solution

  • I did not know that I can use 'validate_change' on the field like 'legs'.

    https://elixirforum.com/t/get-data-from-previous-changeset/15356/2?u=orange-men

    Thx to wmnnd