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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gregvaughn
^ yep, that was exactly what I meant above
NobbZ
I haven’t said “import” anywhere, also it wasn’t my idea, I was just answering @kaa.python’s question on @gregvaughn’s suggestion.
Of course I’m not a fan of importing at all, I’ve been through massive problems due to name clashing.
Aside of that,
view-module,controller-module and all this stuff, is just an arbitrary distinction that helps you to avoid some boilerplate. At the end, they are just plain modules.OvermindDL1
‘If’
SharedViewis a view module then you should not be importing it anywhere, rather import things in to ‘it’. If it is not a view module then you can import it just fine into other view modules.NobbZ
Usually, there is a module
$MyApp.Webwhich has a functionview/0, which returns a quoted block. Just addalias $MyApp.SharedViewin the quote. You can then access that module from every view asSharedView, by addingalias $MyApp.SharedView, as: SVyou can access it by usingSV.OvermindDL1
Let me describe the system:
A ‘View’ module (one that uses the web’s :view) compiles the templates in the same ‘name’ into the View module itself (specifically in ‘render/2’ functions).
So if you want something accessible from inside a template, then you make it accessible from inside a view module.
So say you have a view module named
BlahView, and you have templates in atemplates/blahdirectory, then anything you alias or import or just define straight in theBlahViewwill be accessible to the templates, just like if the templates where inBlahViewtoo (because they actually are).kaa.python
I don’t understand, say that more simply.
What’s MyApp.Web.view ?
Why would it be imported globally?
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.SharedViewLostKobrakai
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.
kaa.python
how do I alias SharedView into an html template? Where should I call “alias MyApp.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.