Neither `%_{}` nor `%self{}` can be supported because they already have
a meaning in pattern matches. The former means _any_ struct and the
latter binds the matched struct name to the variable `self`.
You can give `__MODULE__` another name with an alias:
alias __MODULE__, as: Struct def connect(%Struct{} = channel)
On January 21, 2022, "gmail.com" <[email protected]> wrote:
> It is common to define a struct together with various functions that
> access that struct in the module:
>
> defmodule Chat.Channel do
> defstruct name: "", public?: true
>
> def new do
> %Chat.Channel{name: "Untitled"}
> end
>
> def connect(%Chat.Channel{} = channel) do
> IO.inspect(channel)
> end
> end
>
> It is also common to alias the struct for easier access
>
> defmodule Chat.Channel do
> defstruct name: "", public?: true
>
> alias Chat.Channel
>
> # ...
> end
>
> But, say, renaming the module would require manually replacing all
> struct occurrences with the new module name. Aliasing can help, but if
> the last bit should be updated too(say Chat.Channel should be updated
> to Chat.Room) it would still require to manually replace everything.
>
> There is a workaround to use __MODULE__, but IMO the code looks a bit
> ugly
>
> defmodule Chat.Channel do
> defstruct name: "", public?: true
>
> def new do
> %__MODEUL__{name: "Untitled"}
> end
>
> def connect(%__MODEUL__{} = channel) do
> IO.inspect(channel)
> end
> end
>
> I think It would be great to have some kind of shortcut(syntactic
> sugar) to access the struct within the module.
> First I thought about something like %_(%%, %. etc) but this way it
> looks a bit cryptic
>
> def connect(%_{} = channel) do
>
> So maybe something like %self would work
>
> defmodule Chat.Channel do
> defstruct name: "", public?: true
>
> def new do
> %self{name: "Untitled"}
> end
>
> def connect(%self{} = channel) do
> IO.inspect(channel)
> end
> end
>
> What do you think?
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