ElixirDrops

Welcome to ElixirDrops!

Hello there and welcome to the ultimate hub for the Elixir community! Whether you're a seasoned developer or just starting your journey, ElixirDrops is the perfect place to discover, share, and discuss the best tips and tricks for mastering Elixir. Sign in to explore, learn and become a contributor on this platform.

Keeping Oban's time units explicit

Oban's Lifeline and Pruner accept raw integers in different units: rescue_after is milliseconds, while max_age is seconds. On current Oban releases, ...

almirsarajcic

12 hours ago

Catching GenServer.call/3 timeout exits

GenServer.call/3 does not return {:error, :timeout} when the server misses its deadline. It exits the caller instead....

almirsarajcic

yesterday

Keeping self() straight in on_exit callbacks

An on_exit callback looks like it belongs to the test that registered it, but self() inside the callback is not the test PID:...

almirsarajcic

2 days ago

Clearing inherited variables in System.cmd

Passing env: [] to System.cmd/3 does not clear the child environment....

almirsarajcic

3 days ago

Running Task.async_stream/3 for side effects

Calling Task.async_stream/3 does not start any tasks:...

almirsarajcic

4 days ago

Keeping timeouts active while tracing tests

A test can stop timing out when you rerun it with --trace:...

almirsarajcic

5 days ago

Starting only what a FLAME runner needs

When FLAME boots a remote runner, it starts your application there, so your application has to decide which supervision children belong on that runner...

almirsarajcic

6 days ago

Keeping stale gzip assets out of Phoenix tests

I spent too long debugging a LiveView hook in ElixirDrops because the browser kept running old JavaScript. The source and freshly built app.js were co...

almirsarajcic

7 days ago

Let ExUnit shut down your test processes

Start test-owned processes with start_supervised!/1 so ExUnit waits for them to shut down before running your cleanup callbacks....

almirsarajcic

8 days ago

Put `phx-change` inputs inside a form

Put every input with its own phx-change binding inside a form. Outside one, the markup looks wired, but LiveView will not send the event....

almirsarajcic

9 days ago

Check the exit status from `System.cmd/3`

Check the exit status when wrapping an external command. A nonzero exit from the program does not make System.cmd/3 raise....

almirsarajcic

10 days ago

Make `capture_log` assertions test-specific

Do not assert on generic text in logs captured by async tests....

almirsarajcic

11 days ago

Avoid `File.cd!/2` in async tests

Do not use File.cd!/2 to isolate filesystem work in concurrent tests. Its callback looks scoped, but the current working directory belongs to the enti...

almirsarajcic

12 days ago

Build sequence diffs with List.myers_difference/2

Use List.myers_difference/2 to turn two sequences into an edit script without adding a diff dependency....

almirsarajcic

13 days ago

Capture warnings with Code.with_diagnostics/2

Use Code.with_diagnostics/2 when warnings and errors need to become structured data instead of terminal text....

almirsarajcic

15 days ago