# "(FunctionClauseError) no function clause matching" error **URL:** \ **Category:** Questions\ **Tags:** ecto, mix, phoenix, troubleshooting, learning-elixir, liveview, genserver\ **Created:** [May 3, 2021, 1:23am UTC](https://forum.elixirforum.com/t/functionclauseerror-no-function-clause-matching-error/39366 "2021-05-03T01:23:52Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![learning123](https://forum.elixirforum.com/letter_avatar_proxy/v4/letter/l/c6cbf5/32.png) [@learning123](https://forum.elixirforum.com/u/learning123)\ **Post date:** [May 3, 2021, 1:23am UTC](https://forum.elixirforum.com/t/functionclauseerror-no-function-clause-matching-error/39366/1 "2021-05-03T01:23:52Z")
Hey all, I’m new to elixir and getting the following error: ```elixir ** (FunctionClauseError) no function clause matching in TSS.DriverStatuses.list_assignable_drivers_by_truck_load/1 ``` So in my module, I define a `get_remaining_time` function that takes a `truck_load`: ```elixir defp get_remaining_time(truck_load) do time_since_available = DriverStatuses.list_assignable_drivers_by_truck_load(truck_load) Formatters.decorate_time_since_available(time_since_available) end ``` This function uses the `list_assignable_drivers_by_truck_load` in the `DriverStatuses` module, which looks like this: ```elixir def list_assignable_drivers_by_truck_load(%TruckLoad{ well: %{id: well_id}, pull_point: pull_point }) do base_assignable_drivers_query() |> apply_default_select(pull_point.point) |> filter({:well_id, well_id}) |> sort({:distance_in_meters, :asc}, %{"pull_point_id" => pull_point.id}) |> preload(driver: [:trailer_type, driver_contract: [:carrier]]) |> Repo.all() end ``` and then formats it using the `decorate_time_since_available` function in the `Formatters` module, which looks like this: ```elixir def decorate_time_since_available(%{driver_status: %{last_available_at: last_available_at}}) when not is_nil(last_available_at), do: humanize_time(DateTime.diff(DateTime.utc_now(), last_available_at), :seconds, :minutes) <> " (hh:mm)" def decorate_time_since_available(_), do: "N/A" ``` Finally, I am calling the function like so: ```elixir ``` I think I’m not pattern matching correctly, but nothing I’ve tried is working. How can I fix this? Thanks so much!! ---
**Author:** ![derek-zhou](https://forum.elixirforum.com/user_avatar/forum.elixirforum.com/derek-zhou/32/19943_2.png) [@derek-zhou](https://forum.elixirforum.com/u/derek-zhou)\ **Post date:** [May 3, 2021, 1:39am UTC](https://forum.elixirforum.com/t/functionclauseerror-no-function-clause-matching-error/39366/2 "2021-05-03T01:39:05Z")
So your `@truck_load` is not a `%TruckLoad(...}` then. the error message after the `** (FunctionClausError)...` line should give you more clue ---
**Author:** ![eksperimental](https://forum.elixirforum.com/user_avatar/forum.elixirforum.com/eksperimental/32/1401_2.png) [@eksperimental](https://forum.elixirforum.com/u/eksperimental)\ **Post date:** [May 3, 2021, 8:39pm UTC](https://forum.elixirforum.com/t/functionclauseerror-no-function-clause-matching-error/39366/3 "2021-05-03T20:39:51Z")
or it is, but the contents do not pattern match ---
**Author:** ![learning123](https://forum.elixirforum.com/letter_avatar_proxy/v4/letter/l/c6cbf5/32.png) [@learning123](https://forum.elixirforum.com/u/learning123)\ **Post date:** [May 3, 2021, 11:42pm UTC](https://forum.elixirforum.com/t/functionclauseerror-no-function-clause-matching-error/39366/4 "2021-05-03T23:42:07Z")
So, I fixed that issue I believe by passing in a struct: ```elixir defp get_remaining_time(truck_load) do current_truck_load = %TruckLoad{ pull_point: truck_load.pull_point, well: %Well{id: truck_load.well_id} } driver = TSS.DriverStatuses.list_assignable_drivers_by_truck_load(current_truck_load) time_elapsed = Formatters.decorate_time_since_available(driver) "#{time_elapsed} (hh:mm)" end ``` But now I am getting this error: **(KeyError) key :pull\_point not found in: ~huge map of `truck_load`’s contents~** The `truck_load` map has a `pull_point` key, but it’s value is `pull_point: #Ecto.Association.NotLoaded ` I believe I need to preload `pull_point`, but I shouldn’t do that on the front end, right? I’m not sure how else to access that data though.. Thanks so much for the help, I really really appreciate it!!! ---
**Author:** ![al2o3cr](https://forum.elixirforum.com/user_avatar/forum.elixirforum.com/al2o3cr/32/3457_2.png) [@al2o3cr](https://forum.elixirforum.com/u/al2o3cr)\ **Post date:** [May 4, 2021, 3:21pm UTC](https://forum.elixirforum.com/t/functionclauseerror-no-function-clause-matching-error/39366/5 "2021-05-04T15:21:19Z")
> [@learning123](#): > > **(KeyError) key :pull\_point not found in: ~huge map of `truck_load`’s contents~** > > The `truck_load` map has a `pull_point` key These two statements are not compatible - the error is specifically stating that `truck_load` does NOT have a `:pull_point` key at the beginning of `get_remaining_time`. Some things to investigate: - where is the argument to `get_remaining_time` coming from? The code in your initial post suggested it was intended to be a `%TruckLoad{}` struct, but wasn’t. - as shown in these posts, `list_assignable_drivers_by_truck_load` will return a list of structs (from `Repo.all`) - but `decorate_time_since_available` expects a _single_ driver. Should that be `Repo.one`? ---
**Author:** ![AstonJ](https://forum.elixirforum.com/user_avatar/forum.elixirforum.com/astonj/32/15_2.png) [@AstonJ](https://forum.elixirforum.com/u/AstonJ)\ **Post date:** [July 6, 2022, 10:21pm UTC](https://forum.elixirforum.com/t/functionclauseerror-no-function-clause-matching-error/39366/6 "2022-07-06T22:21:15Z")
2 posts were split to a new topic: [FunctionClauseError on running mix rustler.new (no function clause matching in OptionParser.validate\_swit)](https://forum.elixirforum.com/t/functionclauseerror-on-running-mix-rustler-new-no-function-clause-matching-in-optionparser-validate-swit/48796)