elixir - Read files in Phoenix in production mode -

i've phoenix app (i created --api flag) has additional data required process requests store in priv/data/filters.csv.

so works fine in dev mode, can read file like: file.stream!("priv/data/filters.csv"), once app delivered using mix edeliver update file not accessible anymore.

i can see folder in build directory, after app delivered there no such folder priv. i'm not sure why it's not copied deliver folder.

what i'm doing wrong? need copy these files after deliver process? can store files have use in prod mode?

you should use :code.priv_dir/1 absolute path priv directory of application @ runtime. work erlang releases created e.g. distillery:

file.stream!(path.join(:code.priv_dir(:my_app), "data/filters.csv")) 

for me, after doing mix_env=prod mix release, file priv/foo copied _build/prod/lib/my_app/priv/foo.