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Question

I have been learning php and symfony for the last 2 days, working through a video tutorial as I need to learn to use php and symfony etc as the front end to a spring app written in java.

I am at the section on invalid logins and there is something I just cant get my head around, I dont know if its the syntax or what but it really isnt clear what is happening here:

{% if error %}
        <div>{{error.messageKey|trans(error.messageData, 'security') }}</div>
    {% endif %}

I understand the error object is available implicitly as the framework puts it there but what is happening? It looks like the messageKey value is being piped into the trans function but what is that function doing?

If I just print out error.messageKey without the trans functions its the same, is the pipe symbol an OR and not a pipe in this instance?

Answer 1

The pipe symbol is a twig 'filter'. It tell symfony and twig that the text at his left need to be translated.

Read more about it here http://symfony.com/doc/current/book/translation.html

From the comment :

It looks like sometimes that exception Authentication could contain a placeholder array of values which are then used to transpose the error.messageKey which is the actual message string but in the example I am following the array of placeholders is actually empty and the string does not contain and %var% placeholders anyway so I always get the standard "Invalid credentials." <div>{{ 'Invalid %vara% %name%' |trans({'%name%': 'Steve', '%vara%':'login'}, "app") }}</div> – berimbolo