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lib/exzeitable/parameters/validation.ex
defmodule Exzeitable.Parameters.Validation do
@moduledoc "Using these instead of Keyword.fetch! to provide nice easily resolvable errors."
alias Exzeitable.Parameters.ParameterError
@doc "If you have parent then you need belongs_to, and vice versa."
@spec paired_options(map) :: map | nil
def paired_options(%{"parent" => nil, "belongs_to" => nil} = session) do
session
end
def paired_options(%{"parent" => nil}) do
raise ParameterError,
message:
"[:parent] record needs to be defined if belongs_to is defined, i.e. Repo.find(site.id)"
end
def paired_options(%{"belongs_to" => nil}) do
raise ParameterError,
message: "[:belongs_to] needs to be defined if parent is defined, i.e. :site"
end
def paired_options(session) do
session
end
end