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iex> Decimal.mult(Decimal.cast("0.8765309"), 100)
#Decimal<87.6530900>

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Decimal.mult(Decimal.cast(example_decimal), 100)

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defp mathematical_validation(changeset) do
  revenue = get_field(changeset, :revenue)
  expense = get_field(changeset, :expense)
  net_gain = get_field(changeset, :net_gain)

  case Decimal.sub(revenue, expense) == Decimal.new(net_gain) do
      true -> changeset
      _ -> add_error(changeset, :net_gain, "must equal revenue minus expense")
  end
end

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def validate(changeset) do
  changeset
  |> validate_required([:revenue, :expense, :net_gain])
  |> mathematical_validation()
  |> validate_format(:reference_id, ~r/(^\d+$|\p{L})/u,
    message: "must be a number or contain a letter"
  )
end

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defp mathematical_validation(changeset) do
  revenue = get_field(changeset, :revenue)
  expense = get_field(changeset, :expense)
  net_gain = get_field(changeset, :net_gain)

  with {:is_valid, true} <- {:is_valid, changeset.valid?},
       {math_validation, true} <- 
         {math_validation, Decimal.sub(revenue, expense) == Decimal.new(net_gain)} do
    changeset
  else

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def validate(changeset) do
  changeset
  |> validate_required([:revenue, :expense, :net_gain])
  |> mathematical_validation()
  |> validate_format(:reference_id, ~r/(^\d+$|\p{L})/u,
    message: "must be a number or contain a letter"
  )
end

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def validate(changeset) do
  changeset
  |> validate_required([:revenue, :expense, :net_gain, :first_name])
  |> mathematical_validation()
  |> validate_format(:reference_id, ~r/(^\d+$|\p{L})/u,
    message: "must be a number or contain a letter"
  )
end

defp mathematical_validation(changeset) do

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defp mathematical_validation(changeset) do
  revenue = get_field(changeset, :revenue)
  expense = get_field(changeset, :expense)
  net_gain = get_field(changeset, :net_gain)

  with true <- revenue != nil,
       true <- expense != nil,
       true <- net_gain != nil,
       true <- Decimal.sub(revenue, expense) == Decimal.new(net_gain) do
    changeset

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• How to setup Pow to create a user with a 20 character random string as password
• Also how to reset a users password
• Both actions done using the IEx console
• The docs: https://hexdocs.pm/pow/Pow.Ecto.Schema.html#module-customize-pow-changeset

defmodule Finance.Schemas.User do
  @moduledoc """
  The location of this schema has changed from the default placement upon
  installation (`mix pow.install`). If using the Pow library docs to make any

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import Ecto.Query

alias MyApp.{
    Repo,
    Schemas.User,
    Schemas.Posts,
    Schemas.Comments,
}

example_variable = ["a", "b", "c"]