Phoenix context test files grow fast. A single accounts_test.exs can easily reach 300+ lines, and without structure it becomes hard to find tests, spo...
almirsarajcic
6 days ago
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`Phoenix.LiveView.JS` for client-side interactions
Not every click needs a server roundtrip. Toggling a dropdown, showing a modal, or hiding a deleted item are all pure UI operations — but they're ofte...
almirsarajcic
13 days ago
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`Oban.insert_all/1` doesn't enforce unique job constraints unless you're on the pro license
Oban.insert_all/1 doesn't enforce unique job constraints
Configured unique constraints on your Oban worker but still seeing duplicate jobs when using...
amos-kibet
1 month ago
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Mix.env() doesn't exist in production releases. Your conditional routes will silently fail, and you won't know until deployment. Use Application.compi...
almirsarajcic
2 months ago
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Add query params to Phoenix verified routes with `~p`
Phoenix verified routes handle query parameters with the same ~p sigil you use for paths. Pass a map or keyword list after ?#{} and get compile-time v...
almirsarajcic
2 months ago
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Repeating the same guard logic across multiple functions? Define it once with defguard and use it everywhere - in function heads, case, cond, and with...
almirsarajcic
2 months ago
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Need to log, send a message, or cache a value mid-pipeline without breaking the flow? tap/2 executes a function for its side effect, ignores the retur...
almirsarajcic
3 months ago
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Live Sessions in Phoenix LiveView: Reducing navigation time between LiveViews
The main idea behind live sessions is to reduce navigation time when navigating a group of routes. Normally what happens when navigating between LiveV...
Deankinyua
3 months ago
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`File.stream!/1` processes large files with constant memory
File.read!/1 loads the entire file into memory. A 2GB log file? That's 2GB of RAM. Use File.stream!/1 to process files line-by-line with constant memo...
almirsarajcic
3 months ago
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Stop using `Repo.preload` in loops - use `preload` in queries
Calling Repo.preload/2 inside Enum.map or comprehensions creates N+1 queries - one query to fetch the parent records, then one additional query for ea...
almirsarajcic
3 months ago
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Use `Task.Supervisor` instead of bare `Task.async`
Bare Task.async creates linked tasks that can crash your process or leave zombie tasks running. Task.Supervisor provides supervised tasks with automat...
almirsarajcic
3 months ago
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Two users buying the last item simultaneously can cause overselling. Use PostgreSQL row locks with lock: "FOR UPDATE" to prevent concurrent updates fr...
almirsarajcic
4 months ago
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