I’m learning Pheonix via programming Pheonix > 1.4 book. The chapter 3 code cannot run. defmodule Rumbl.Accounts.User do defstruct [:id, :name, :username] end defmodule Rumbl.Accounts do alias Rumbl.Accounts.User def list_users do [ %User{id: "1", name: "jose", username: "josevalim"} ] end end Then run in iex. I faced this error. ** (CompileError) accounts.ex:7: Rumbl.Accounts.User.__struct__/1 is undefined, cannot expand struct Rumbl.Accounts.User. Make sure the struct name is correct. If the struct name exists and is correct but it still cannot be found, you likely have cyclic module usage in your code [image] What am I wrong?

Sorry for being late to reply. I’m in China so I was sleeping when you asked the question. [image] h1d3r00t: what is different iex -S mix and mix phx.server iex -S mix starts an iex session with all the .ex files in the elixirc paths compiled and loaded (including the .ex files in the dependencies of your project), all the “applications” of your project started, and all the supervision trees built. But, as for a phoenix project, iex -S mix does not start the web server. mix phx.server also compiles all the .ex files, starts, all the applications, and builds all the supervision trees. It also starts the web server, but it does not start an iex session. If you want both, you can try iex -S mix phx.server. [image] h1d3r00t: I tried iex -S accounts.ex but It shows the same error. There is no iex -S your_module.ex. You can start an mix-aware iex session by iex -S mix, and in that session, do whatever you want with your modules. Or, you can type mix eval ' '.

Maybe you should try iex -S mix instead of just iex.

Erlang/OTP 25 [erts-13.0.4] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [jit:ns] ** (Mix) "mix" with no arguments must be executed in a directory with a mix.exs file Now I can see this error. How can I solve this?

oops. this is my mistake. I move the root path. it running well. what is different iex -S mix and mix phx.server ?

I still suffering from this error. I tried iex -S accounts.ex but It shows the same error. ** (CompileError) accounts.ex:10: Rumbl.Accounts.User.__struct__/1 is undefined, cannot expand struct Rumbl.Accounts.User. Make sure the struct name is correct. If the struct name exists and is correct but it still cannot be found, you likely have cyclic module usage in your code I don’t know what it is. Why elixir cannot find the Rumbl.Accounts.User.

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I cannot import(alias) defstruct

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h1d3r00t November 18, 2022, 2:35am 7

Thank you. I solved this problem.