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Accept error tuples in emit #13

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Accept error tuples in emit #13

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704bf7b
more flexible functions
benwilson512 Jan 27, 2020
05ff805
require at least 2 arity function
benwilson512 Jan 28, 2020
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26 changes: 19 additions & 7 deletions lib/fable/events.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -239,18 +239,31 @@ defmodule Fable.Events do
Keyword.t()
) ::
transation_fun
def emit(config, %{__meta__: %Ecto.Schema.Metadata{}} = aggregate, fun, changes \\ %{}, opts)
when is_function(fun, 3) do
def emit(config, %{__meta__: %Ecto.Schema.Metadata{}} = aggregate, fun, changes \\ %{}, opts) do
check_schema_fields(aggregate)

fn ->
aggregate = lock(aggregate, config.repo) || aggregate
events = fun.(aggregate, config.repo, changes)
result_of_applied_events = handle_events(config, aggregate, events, opts)
rollback_on_error(config.repo, result_of_applied_events)

case call_fun(fun, aggregate, config, changes) do
{:error, reason} ->
config.repo.rollback(reason)

events ->
result_of_applied_events = handle_events(config, aggregate, events, opts)
rollback_on_error(config.repo, result_of_applied_events)
end
end
end

defp call_fun(fun, aggregate, config, _changes) when is_function(fun, 2) do
fun.(aggregate, config.repo)
end

defp call_fun(fun, aggregate, config, changes) when is_function(fun, 3) do
fun.(aggregate, config.repo, changes)
end

@doc false
@spec emit(
Fable.Config.t(),
Expand All @@ -261,8 +274,7 @@ defmodule Fable.Events do
Keyword.t()
) ::
Ecto.Multi.t()
def emit(%{repo: repo} = config, %Ecto.Multi{} = multi, aggregate, name, fun, opts)
when is_function(fun, 3) do
def emit(%{repo: repo} = config, %Ecto.Multi{} = multi, aggregate, name, fun, opts) do
Ecto.Multi.run(multi, name, fn ^repo, changes ->
emit(config, aggregate, fun, changes, opts)
|> repo.transaction()
Expand Down