Catalyst::Middleware::Stash(3p)

NAME
Catalyst::Middleware::Stash - The Catalyst stash - in middleware

DESCRIPTION
We've moved the Catalyst stash to middleware. Please don't use this directly since it is likely to move off the Catalyst namespace into a stand alone distribution

We store a coderef under the "PSGI_KEY" which can be dereferenced with key values or nothing to access the underlying hashref.

Anything placed into the stash will be available in the stash of any 'mounted' Catalyst applications. A mounted Catalyst application may set the stash and 'pass back' information to the parent application. Non Catalyst applications may use this middleware to access and set stash values.

Please note I highly recommend having a stronger interface than a stash key between applications.

For more information the current test case t/middleware-stash.t is the best documentation.

SUBROUTINES
This class defines the following subroutines.

  PSGI_KEY
Returns the hash key where we store the stash. You should not assume the string value here will never change! Also, its better to use "get_stash" or "stash".

  get_stash
Expect: $psgi_env.

Exportable subroutine.

Get the stash out of the $env.

  stash
Expects: An object that does "env" and arguments

Exportable subroutine.

Given an object with a method "env" get or set stash values, either as a method or via hashref modification. This stash is automatically reset for each request (it is not persistent or shared across connected clients. Stash key / value are stored in memory.

    use Plack::Request;
    use Catalyst::Middleware::Stash 'stash';

    my $app = sub {
      my $env = shift;
      my $req = Plack::Request->new($env);
      my $stashed = $req->stash->{in_the_stash};  # Assume the stash was previously populated.

      return [200, ['Content-Type' => 'text/plain'],
        ["I found $stashed in the stash!"]];
    };

If the stash does not yet exist, an exception is thrown.

METHODS
This class defines the following methods.

  call
Used by plack to call the middleware