elixir - Why is params_for not going through the changeset? -


why params_for not going through changeset model main question. params_for generates 4 digits , 2 letters postal_code (could lowercase or uppercase). if params_for going trough changeset, uppercase afterwards. why test fail?

error message: expected truthy, got nil

i've company model, changeset:

def changeset(company, params \\ %{})   company   ...   |> maybe_sanitize_postal_code(:postal_code)   ... end  defp maybe_sanitize_postal_code(changeset, attr)   case get_change(changeset, attr)     nil -> changeset     postal_code -> put_change(changeset, attr, sanitize_postal_code(postal_code))   end end  defp sanitize_postal_code(postal_code)   postal_code   |> string.replace(~r/\s+/, "")   |> string.upcase() end

i have test:

test "create company postal code", %{conn: conn, user: user}   params = params_for(:company)   conn = post conn, company_path(conn, :create), company: params   assert json_response(conn, 201)["company"]["id"]   company = repo.get_by(company, params)   assert company   assert [user] == repo.all ecto.assoc(company, :users)   ... end

params_for docs: https://hexdocs.pm/ex_machina/exmachina.ecto.html#c:params_for/2

if params contains lowercased postal_code, gets upcased changeset. however, repo.get_by(company, params) still looks lowercase postal code, returning nil


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