Add ability to render view from string

[RomeroMsk]

I can't find the way to render a view from string (not from file). I want to use template engine (Twig or Smarty) to render texts from templates stored in DB. For example, store email message template in DB table and generate email body from it on the fly.

[klimov-paul]

Use old good eval().

[nineinchnick]

@klimov-paul why would you ever recommend eval()? @RomeroMsk you're asking what to use instead of render() in a controllers action? You can use renderContent.

[RomeroMsk]

@klimov-paul, are you serious?
@nineinchnick, yes I need to use render() method (or something like renderString()) with string content instead of view file path.

[nineinchnick]

I've updated my response above, use renderContent.

[klimov-paul]

I've updated my response above, use renderContent.

I can not see how renderContent() can help here. It will just pass the PHP code as a plain string into the layout file.

As far as I understand you wish to evaludate some string, stored in DB, as a view file content. There is no way for it instead of using eval().
As far as I remember Smarty has built in eval function (or plugin), which allows evalution of a string as Smarty template content. As for Twig - I am unsure. For plain PHP view - native eval() is only option.

[RomeroMsk]

@nineinchnick, can you show an example of how to use this with Twig and not in controller context? Let's say we have $template = 'Hello, {{ username }}!' and want to put render result into $result, using ['username' => 'Test'] as parameters.

[RomeroMsk]

@klimov-paul, I've created this issue to ask for an ability to use stirng content instead of files in ViewRenderer. I don't like your workaround.

[klimov-paul]

This is not walk around - this is the only solution. Of course we can instoduce another method in the View class, but it will do just the same thing.
For smarty you can use following:
http://www.smarty.net/docs/en/language.function.eval.tpl
For Twig - I don't know.

I suppose for your case a special tool should be used like following:
https://mustache.github.io/

[nineinchnick]

@RomeroMsk I think this does not concern Yii at all, you're asking how to process a Twig template. See twig docs.

[RomeroMsk]

@klimov-paul, yes, Mustache is good for this, but it's logic-less. Thanks, anyway.
@nineinchnick, I think you're right, thank you.

[lynicidn]

https://github.com/yiisoft/yii2/issues/6252

[baijunzhen]

@RomeroMsk 你可以这样
Yii::t('yii','you email body {username},send at{date}',['username'=>'foo',‘date’=>date('Y-m-d')]);

[samdark]

yiisoft/yii2#15116

[mikk150]

I have something that renders strings stored in SQL
https://github.com/mikk150/yii2-sql-renderer

adopt it a bit and do your magic

edit:// I use it with conjuction with twig strings, because I do not trust others that much

[samdark]

After thinking, I don't think we should explicitly support that because it will suggest doing that is alright, especially with eval(). #122 may be an option.