Twig accessing protected/private model variables

I have a problem with Twig, (in fact this is not really a problem but it’s disturbing to me)

I have a Post model class in php and i have some protected variables (I also tried with private). To acces them I have a public function in php getMyVariable. If in my controller I try to echo the protected variable it throz me an error Cannot access protected property... so I have to use the function to echo my variable.

This is totally normal and this is what I want

But, then I try to render it in Twig, and I use the same system with the function to render my variable, it works, great… But if I try to render directly my protected variable, it works too and this is not really a good practice, is there a way to stop rendering protected/private variable directly in twig (I mean outpassing the getter function)

Answer

Please have a look at the documentation. Twig is not accessing the protected variable, which is impossible, but due to its implementation it’s going to transform your twig code, e.g. foo.bar to $foo.getBar() and check whether that method exists or not, therefor it is able to “access” protected variables

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From Twig‘s documentation

For convenience’s sake foo.bar does the following things on the PHP layer:

- check if foo is an array and bar a valid element;
- if not, and if foo is an object, check that bar is a valid property;
- if not, and if foo is an object, check that bar is a valid method (even if bar is the constructor - use __construct() instead);
- if not, and if foo is an object, check that getBar is a valid method;
- if not, and if foo is an object, check that isBar is a valid method;
- if not, and if foo is an object, check that hasBar is a valid method;
- if not, return a null value.

foo['bar'] on the other hand only works with PHP arrays:

check if foo is an array and bar a valid element;
if not, return a null value.

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