Question about Phoenix and EEx

[Luiz Paulo Vasconcellos]

I'm reading through Phoenix's source code in order to familiarize myself more with the framework and elixir itself.

One thing I can't seem to understand is the rendering process. How are phoenix View helper functions made available in templates? I initially thought it inserted something like <% import MyView %> in each template before compiling, but it doesn't seem so.

I'm still in the beginning of the learning journey, sorry if this is an obvious question. Thanks!

[Michał Muskała]

The views are compiled to just being functions in the view module. So exactly how you can use other functions from a module in a function

in tha module, you can use other functions from the view module in templates.

Michał.

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[Luiz Paulo Vasconcellos]

That makes sense, thanks for the quick answer.

[Rich Morin]

> On Jul 12, 2016, at 06:14, Michał Muskała <mic...@muskala.eu> wrote:
> The views are compiled to just being functions in the view module. So exactly how you can use other functions from a module in a function
> in tha module, you can use other functions from the view module in templates.

I suspect there's an easy way to display one of these compiled functions;
might you know this?

-r

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http://www.cfcl.com/rdm Rich Morin r...@cfcl.com
http://www.cfcl.com/rdm/resume San Bruno, CA, USA +1 650-873-7841

Software system design, development, and documentation

[OvermindDL1]

```elixir

iex(1)> MyServer.IndexView.module_info[:exports]

[__info__: 1, __phoenix_recompile__?: 0, __resource__: 0, __templates__: 0,

 breadcrumb: 4, menu: 4, render: 1, render: 2, template_not_found: 2,

 module_info: 0, module_info: 1]

```

It generated the `render/1/2` and `template_not_found/2` functions.  The code that does starts at:  https://github.com/phoenixframework/phoenix/blob/master/lib/phoenix/template.ex#L136

And you can follow it from there.  :-)

[OvermindDL1]

Oh and yes, the actual EEX compilation happens at:  https://github.com/elixir-lang/elixir/blob/v1.3.1/lib/eex/lib/eex.ex#L150

[Luiz Paulo Vasconcellos]

From what I found in the source, the compilation with EEx happens in `eex_engine` here  https://github.com/phoenixframework/phoenix/blob/master/lib/phoenix/template/eex_engine.ex#L8,

and the generate functions for each template are defined here https://github.com/phoenixframework/phoenix/blob/master/lib/phoenix/template.ex#L373-L393.

It doesn't seem to call `EEx.function_from_file`, but the end result is pretty much the same.