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

Catalyst::Middleware::Stash(3pm) User Contributed Perl Documentation Catalyst::Middleware::Stash(3pm)

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
2017-07-11 perl v5.24.1