kaa.python
I have a function in SharedView:
def my_func1(var1) do
"hello #{var1}"
end
I want to be able to call it from my html templates using only its name, without the name of the module. I’ve tried this:
# web.ex
def view do
quote do
use Phoenix.View, root: "web/templates"
# ............
import MyApp.SharedView, only: [my_func1: 1]
but it threw an exception:
you are trying to use the module MyApp.SharedView which is currently being defined.
How should I import it properly?
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chrismccord
Since your
SharedViewmodule also has thisquoteblock injected, it’s trying to import itself, which is causing the error. The easiest option is to my those function, i.e.my_func/1to another module that you import in theviewblock instead of defining it on SharedViewkaa.python
then what’s the function of SharedView?
LostKobrakai
SharedView is nothing special. It’s a view module like any other, but happens to be named Shared. You can for example use it like that in a controller:
render(conn, SharedView, "partial.html", assigns)Likewise it does work in all other places where you can specify a view modules to render things.If you want to share your posted function and not all the ability to render things just create a non-view helper module. Phoenix does that with the ErrorHelpers module.
kaa.python
I have a function which I’m using across many html templates. where should I put it if not in SharedView?
In Rails we have helpers for each controller, in Phoenix – Views, right?
LostKobrakai
SharedView is for shared templates. It’s not ideal to share functions in it with other views. To share function just copy what phoenix does with ErrorHelpers. There’s a ErrorHelpers module in the views folder and that module is imported in the web.ex file for views. ErrorHelpers is a plain elixir module, so you don’t have that circular import like with SharedView.
gregvaughn
Another option is to go ahead and use
SharedViewbut don’t insist on importing the function and instead aliasSharedView. It means all the callsites will beSharedView.my_func()but it’s more explicit and clearer to people new to the codebase where that function is defined.The more time I spend in Elixir the more I shift from imports to aliases.
kaa.python
how do I alias SharedView into an html template? Where should I call “alias MyApp.SharedView”?
LostKobrakai
The templates are essentially part of the related view module, so just alias it in the view module of the template you need the function in.
gregvaughn
You can call it right where you were trying to import if you want it globally aliased in all views. In
MyApp.Web.view:alias MyApp.SharedViewkaa.python
I don’t understand, say that more simply.
What’s MyApp.Web.view ?
Why would it be imported globally?