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.\" ========================================================================
.\"
.IX Title "Mojolicious::Plugin::DefaultHelpers 3pm"
.TH Mojolicious::Plugin::DefaultHelpers 3pm "2019-02-05" "perl v5.28.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Mojolicious::Plugin::DefaultHelpers \- Default helpers plugin
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&  # Mojolicious
\&  $app\->plugin(\*(AqDefaultHelpers\*(Aq);
\&
\&  # Mojolicious::Lite
\&  plugin \*(AqDefaultHelpers\*(Aq;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Mojolicious::Plugin::DefaultHelpers is a collection of helpers for
Mojolicious.
.PP
This is a core plugin, that means it is always enabled and its code a good
example for learning to build new plugins, you're welcome to fork it.
.PP
See \*(L"\s-1PLUGINS\*(R"\s0 in Mojolicious::Plugins for a list of plugins that are available
by default.
.SH "HELPERS"
.IX Header "HELPERS"
Mojolicious::Plugin::DefaultHelpers implements the following helpers.
.SS "accepts"
.IX Subsection "accepts"
.Vb 2
\&  my $formats = $c\->accepts;
\&  my $format  = $c\->accepts(\*(Aqhtml\*(Aq, \*(Aqjson\*(Aq, \*(Aqtxt\*(Aq);
.Ve
.PP
Select best possible representation for resource from \f(CW\*(C`format\*(C'\fR \f(CW\*(C`GET\*(C'\fR/\f(CW\*(C`POST\*(C'\fR
parameter, \f(CW\*(C`format\*(C'\fR stash value or \f(CW\*(C`Accept\*(C'\fR request header with
\&\*(L"accepts\*(R" in Mojolicious::Renderer, defaults to returning the first extension if
no preference could be detected.
.PP
.Vb 2
\&  # Check if JSON is acceptable
\&  $c\->render(json => {hello => \*(Aqworld\*(Aq}) if $c\->accepts(\*(Aqjson\*(Aq);
\&
\&  # Check if JSON was specifically requested
\&  $c\->render(json => {hello => \*(Aqworld\*(Aq}) if $c\->accepts(\*(Aq\*(Aq, \*(Aqjson\*(Aq);
\&
\&  # Unsupported representation
\&  $c\->render(data => \*(Aq\*(Aq, status => 204)
\&    unless my $format = $c\->accepts(\*(Aqhtml\*(Aq, \*(Aqjson\*(Aq);
\&
\&  # Detected representations to select from
\&  my @formats = @{$c\->accepts};
.Ve
.SS "app"
.IX Subsection "app"
.Vb 1
\&  %= app\->secrets\->[0]
.Ve
.PP
Alias for \*(L"app\*(R" in Mojolicious::Controller.
.SS "b"
.IX Subsection "b"
.Vb 1
\&  %= b(\*(AqJoel is a slug\*(Aq)\->slugify
.Ve
.PP
Turn string into a Mojo::ByteStream object.
.SS "c"
.IX Subsection "c"
.Vb 1
\&  %= c(\*(Aqa\*(Aq, \*(Aqb\*(Aq, \*(Aqc\*(Aq)\->shuffle\->join
.Ve
.PP
Turn list into a Mojo::Collection object.
.SS "config"
.IX Subsection "config"
.Vb 1
\&  %= config \*(Aqsomething\*(Aq
.Ve
.PP
Alias for \*(L"config\*(R" in Mojolicious.
.SS "content"
.IX Subsection "content"
.Vb 7
\&  %= content foo => begin
\&    test
\&  % end
\&  %= content bar => \*(AqHello World!\*(Aq
\&  %= content \*(Aqfoo\*(Aq
\&  %= content \*(Aqbar\*(Aq
\&  %= content
.Ve
.PP
Store partial rendered content in a named buffer and retrieve it later,
defaults to retrieving the named buffer \f(CW\*(C`content\*(C'\fR, which is used by the
renderer for the \f(CW\*(C`layout\*(C'\fR and \f(CW\*(C`extends\*(C'\fR features. New content will be ignored
if the named buffer is already in use.
.SS "content_for"
.IX Subsection "content_for"
.Vb 4
\&  % content_for foo => begin
\&    test
\&  % end
\&  %= content_for \*(Aqfoo\*(Aq
.Ve
.PP
Same as \*(L"content\*(R", but appends content to named buffers if they are already
in use.
.PP
.Vb 7
\&  % content_for message => begin
\&    Hello
\&  % end
\&  % content_for message => begin
\&    world!
\&  % end
\&  %= content \*(Aqmessage\*(Aq
.Ve
.SS "content_with"
.IX Subsection "content_with"
.Vb 4
\&  % content_with foo => begin
\&    test
\&  % end
\&  %= content_with \*(Aqfoo\*(Aq
.Ve
.PP
Same as \*(L"content\*(R", but replaces content of named buffers if they are
already in use.
.PP
.Vb 7
\&  % content message => begin
\&    world!
\&  % end
\&  % content_with message => begin
\&    Hello <%= content \*(Aqmessage\*(Aq %>
\&  % end
\&  %= content \*(Aqmessage\*(Aq
.Ve
.SS "continue"
.IX Subsection "continue"
.Vb 1
\&  $c\->continue;
.Ve
.PP
Continue dispatch chain from an intermediate destination with
\&\*(L"continue\*(R" in Mojolicious::Routes.
.SS "csrf_token"
.IX Subsection "csrf_token"
.Vb 1
\&  %= csrf_token
.Ve
.PP
Get \s-1CSRF\s0 token from \*(L"session\*(R", and generate one if none exists.
.SS "current_route"
.IX Subsection "current_route"
.Vb 4
\&  % if (current_route \*(Aqlogin\*(Aq) {
\&    Welcome to Mojolicious!
\&  % }
\&  %= current_route
.Ve
.PP
Check or get name of current route.
.SS "dumper"
.IX Subsection "dumper"
.Vb 1
\&  %= dumper {some => \*(Aqdata\*(Aq}
.Ve
.PP
Dump a Perl data structure with \*(L"dumper\*(R" in Mojo::Util, very useful for
debugging.
.SS "extends"
.IX Subsection "extends"
.Vb 2
\&  % extends \*(Aqblue\*(Aq;
\&  % extends \*(Aqblue\*(Aq, title => \*(AqBlue!\*(Aq;
.Ve
.PP
Set \f(CW\*(C`extends\*(C'\fR stash value, all additional key/value pairs get merged into the
\&\*(L"stash\*(R".
.SS "flash"
.IX Subsection "flash"
.Vb 4
\&  my $foo = $c\->flash(\*(Aqfoo\*(Aq);
\&  $c      = $c\->flash({foo => \*(Aqbar\*(Aq});
\&  $c      = $c\->flash(foo => \*(Aqbar\*(Aq);
\&  %= flash \*(Aqfoo\*(Aq
.Ve
.PP
Data storage persistent only for the next request, stored in the \*(L"session\*(R".
.PP
.Vb 3
\&  # Show message after redirect
\&  $c\->flash(message => \*(AqUser created successfully!\*(Aq);
\&  $c\->redirect_to(\*(Aqshow_user\*(Aq, id => 23);
.Ve
.SS "inactivity_timeout"
.IX Subsection "inactivity_timeout"
.Vb 1
\&  $c = $c\->inactivity_timeout(3600);
.Ve
.PP
Use \*(L"stream\*(R" in Mojo::IOLoop to find the current connection and increase
timeout if possible.
.PP
.Vb 2
\&  # Longer version
\&  Mojo::IOLoop\->stream($c\->tx\->connection)\->timeout(3600);
.Ve
.SS "include"
.IX Subsection "include"
.Vb 2
\&  %= include \*(Aqmenubar\*(Aq
\&  %= include \*(Aqmenubar\*(Aq, format => \*(Aqtxt\*(Aq
.Ve
.PP
Alias for \*(L"render_to_string\*(R" in Mojolicious::Controller.
.SS "is_fresh"
.IX Subsection "is_fresh"
.Vb 3
\&  my $bool = $c\->is_fresh;
\&  my $bool = $c\->is_fresh(etag => \*(Aqabc\*(Aq);
\&  my $bool = $c\->is_fresh(last_modified => $epoch);
.Ve
.PP
Check freshness of request by comparing the \f(CW\*(C`If\-None\-Match\*(C'\fR and
\&\f(CW\*(C`If\-Modified\-Since\*(C'\fR request headers to the \f(CW\*(C`ETag\*(C'\fR and \f(CW\*(C`Last\-Modified\*(C'\fR
response headers with \*(L"is_fresh\*(R" in Mojolicious::Static.
.PP
.Vb 4
\&  # Add ETag/Last\-Modified headers and check freshness before rendering
\&  $c\->is_fresh(etag => \*(Aqabc\*(Aq, last_modified => 1424985708)
\&    ? $c\->rendered(304)
\&    : $c\->render(text => \*(AqI ♥ Mojolicious!\*(Aq);
.Ve
.SS "layout"
.IX Subsection "layout"
.Vb 2
\&  % layout \*(Aqgreen\*(Aq;
\&  % layout \*(Aqgreen\*(Aq, title => \*(AqGreen!\*(Aq;
.Ve
.PP
Set \f(CW\*(C`layout\*(C'\fR stash value, all additional key/value pairs get merged into the
\&\*(L"stash\*(R".
.SS "param"
.IX Subsection "param"
.Vb 1
\&  %= param \*(Aqfoo\*(Aq
.Ve
.PP
Alias for \*(L"param\*(R" in Mojolicious::Controller.
.SS "redirect_to"
.IX Subsection "redirect_to"
.Vb 4
\&  $c = $c\->redirect_to(\*(Aqnamed\*(Aq, foo => \*(Aqbar\*(Aq);
\&  $c = $c\->redirect_to(\*(Aqnamed\*(Aq, {foo => \*(Aqbar\*(Aq});
\&  $c = $c\->redirect_to(\*(Aq/index.html\*(Aq);
\&  $c = $c\->redirect_to(\*(Aqhttp://example.com/index.html\*(Aq);
.Ve
.PP
Prepare a \f(CW302\fR (if the status code is not already \f(CW\*(C`3xx\*(C'\fR) redirect response
with \f(CW\*(C`Location\*(C'\fR header, takes the same arguments as \*(L"url_for\*(R".
.PP
.Vb 3
\&  # Moved Permanently
\&  $c\->res\->code(301);
\&  $c\->redirect_to(\*(Aqsome_route\*(Aq);
\&
\&  # Temporary Redirect
\&  $c\->res\->code(307);
\&  $c\->redirect_to(\*(Aqsome_route\*(Aq);
.Ve
.SS "reply\->asset"
.IX Subsection "reply->asset"
.Vb 1
\&  $c\->reply\->asset(Mojo::Asset::File\->new);
.Ve
.PP
Reply with a Mojo::Asset::File or Mojo::Asset::Memory object using
\&\*(L"serve_asset\*(R" in Mojolicious::Static, and perform content negotiation with
\&\f(CW\*(C`Range\*(C'\fR, \f(CW\*(C`If\-Modified\-Since\*(C'\fR and \f(CW\*(C`If\-None\-Match\*(C'\fR headers.
.PP
.Vb 5
\&  # Serve asset with custom modification time
\&  my $asset = Mojo::Asset::Memory\->new;
\&  $asset\->add_chunk(\*(AqHello World!\*(Aq)\->mtime(784111777);
\&  $c\->res\->headers\->content_type(\*(Aqtext/plain\*(Aq);
\&  $c\->reply\->asset($asset);
\&
\&  # Serve static file if it exists
\&  if (my $asset = $c\->app\->static\->file(\*(Aqimages/logo.png\*(Aq)) {
\&    $c\->res\->headers\->content_type(\*(Aqimage/png\*(Aq);
\&    $c\->reply\->asset($asset);
\&  }
.Ve
.SS "reply\->exception"
.IX Subsection "reply->exception"
.Vb 2
\&  $c = $c\->reply\->exception(\*(AqOops!\*(Aq);
\&  $c = $c\->reply\->exception(Mojo::Exception\->new);
.Ve
.PP
Render the exception template \f(CW\*(C`exception.$mode.$format.*\*(C'\fR or
\&\f(CW\*(C`exception.$format.*\*(C'\fR and set the response status code to \f(CW500\fR. Also sets
the stash values \f(CW\*(C`exception\*(C'\fR to a Mojo::Exception object and \f(CW\*(C`snapshot\*(C'\fR to
a copy of the \*(L"stash\*(R" for use in the templates.
.SS "reply\->file"
.IX Subsection "reply->file"
.Vb 1
\&  $c\->reply\->file(\*(Aq/etc/passwd\*(Aq);
.Ve
.PP
Reply with a static file from an absolute path anywhere on the file system using
\&\*(L"static\*(R" in Mojolicious.
.PP
.Vb 2
\&  # Longer version
\&  $c\->reply\->asset(Mojo::Asset::File\->new(path => \*(Aq/etc/passwd\*(Aq));
\&
\&  # Serve file from an absolute path with a custom content type
\&  $c\->res\->headers\->content_type(\*(Aqapplication/myapp\*(Aq);
\&  $c\->reply\->file(\*(Aq/home/sri/foo.txt\*(Aq);
\&
\&  # Serve file from a secret application directory
\&  $c\->reply\->file($c\->app\->home\->child(\*(Aqsecret\*(Aq, \*(Aqfile.txt\*(Aq));
.Ve
.SS "reply\->not_found"
.IX Subsection "reply->not_found"
.Vb 1
\&  $c = $c\->reply\->not_found;
.Ve
.PP
Render the not found template \f(CW\*(C`not_found.$mode.$format.*\*(C'\fR or
\&\f(CW\*(C`not_found.$format.*\*(C'\fR and set the response status code to \f(CW404\fR. Also sets
the stash value \f(CW\*(C`snapshot\*(C'\fR to a copy of the \*(L"stash\*(R" for use in the
templates.
.SS "reply\->static"
.IX Subsection "reply->static"
.Vb 2
\&  my $bool = $c\->reply\->static(\*(Aqimages/logo.png\*(Aq);
\&  my $bool = $c\->reply\->static(\*(Aq../lib/MyApp.pm\*(Aq);
.Ve
.PP
Reply with a static file using \*(L"static\*(R" in Mojolicious, usually from the
\&\f(CW\*(C`public\*(C'\fR directories or \f(CW\*(C`DATA\*(C'\fR sections of your application. Note that this
helper uses a relative path, but does not protect from traversing to parent
directories.
.PP
.Vb 3
\&  # Serve file from a relative path with a custom content type
\&  $c\->res\->headers\->content_type(\*(Aqapplication/myapp\*(Aq);
\&  $c\->reply\->static(\*(Aqfoo.txt\*(Aq);
.Ve
.SS "respond_to"
.IX Subsection "respond_to"
.Vb 5
\&  $c = $c\->respond_to(
\&    json => {json => {message => \*(AqWelcome!\*(Aq}},
\&    html => {template => \*(Aqwelcome\*(Aq},
\&    any  => sub {...}
\&  );
.Ve
.PP
Automatically select best possible representation for resource from \f(CW\*(C`format\*(C'\fR
\&\f(CW\*(C`GET\*(C'\fR/\f(CW\*(C`POST\*(C'\fR parameter, \f(CW\*(C`format\*(C'\fR stash value or \f(CW\*(C`Accept\*(C'\fR request header,
defaults to \*(L"default_format\*(R" in Mojolicious::Renderer or rendering an empty
\&\f(CW204\fR response. Each representation can be handled with a callback or a hash
reference containing arguments to be passed to
\&\*(L"render\*(R" in Mojolicious::Controller.
.PP
.Vb 6
\&  # Everything else than "json" and "xml" gets a 204 response
\&  $c\->respond_to(
\&    json => sub { $c\->render(json => {just => \*(Aqworks\*(Aq}) },
\&    xml  => {text => \*(Aq<just>works</just>\*(Aq},
\&    any  => {data => \*(Aq\*(Aq, status => 204}
\&  );
.Ve
.PP
For more advanced negotiation logic you can also use \*(L"accepts\*(R".
.SS "session"
.IX Subsection "session"
.Vb 1
\&  %= session \*(Aqfoo\*(Aq
.Ve
.PP
Alias for \*(L"session\*(R" in Mojolicious::Controller.
.SS "stash"
.IX Subsection "stash"
.Vb 2
\&  %= stash \*(Aqfoo\*(Aq
\&  % stash foo => \*(Aqbar\*(Aq;
.Ve
.PP
Alias for \*(L"stash\*(R" in Mojolicious::Controller.
.PP
.Vb 1
\&  %= stash(\*(Aqname\*(Aq) // \*(AqSomebody\*(Aq
.Ve
.SS "timing\->begin"
.IX Subsection "timing->begin"
.Vb 1
\&  $c\->timing\->begin(\*(Aqfoo\*(Aq);
.Ve
.PP
Create named timestamp for \*(L"timing\->elapsed\*(R".
.SS "timing\->elapsed"
.IX Subsection "timing->elapsed"
.Vb 1
\&  my $elapsed = $c\->timing\->elapsed(\*(Aqfoo\*(Aq);
.Ve
.PP
Return fractional amount of time in seconds since named timstamp has been
created with \*(L"timing\->begin\*(R" or \f(CW\*(C`undef\*(C'\fR if no such timestamp exists.
.PP
.Vb 5
\&  # Log timing information
\&  $c\->timing\->begin(\*(Aqdatabase_stuff\*(Aq);
\&  ...
\&  my $elapsed = $c\->timing\->elapsed(\*(Aqdatabase_stuff\*(Aq);
\&  $c\->app\->log\->debug("Database stuff took $elapsed seconds");
.Ve
.SS "timing\->rps"
.IX Subsection "timing->rps"
.Vb 1
\&  my $rps = $c\->timing\->rps(\*(Aq0.001\*(Aq);
.Ve
.PP
Return fractional number of requests that could be performed in one second if
every singe one took the given amount of time in seconds or \f(CW\*(C`undef\*(C'\fR if the
number is too low.
.PP
.Vb 6
\&  # Log more timing information
\&  $c\->timing\->begin(\*(Aqweb_stuff\*(Aq);
\&  ...
\&  my $elapsed = $c\->timing\->elapsed(\*(Aqweb_stuff\*(Aq);
\&  my $rps     = $c\->timing\->rps($elapsed);
\&  $c\->app\->log\->debug("Web stuff took $elapsed seconds ($rps per second)");
.Ve
.SS "timing\->server_timing"
.IX Subsection "timing->server_timing"
.Vb 3
\&  $c\->timing\->server_timing(\*(Aqmetric\*(Aq);
\&  $c\->timing\->server_timing(\*(Aqmetric\*(Aq, \*(AqSome Description\*(Aq);
\&  $c\->timing\->server_timing(\*(Aqmetric\*(Aq, \*(AqSome Description\*(Aq, \*(Aq0.001\*(Aq);
.Ve
.PP
Create \f(CW\*(C`Server\-Timing\*(C'\fR header with optional description and duration.
.PP
.Vb 2
\&  # "Server\-Timing: miss"
\&  $c\->timing\->server_timing(\*(Aqmiss\*(Aq);
\&
\&  # "Server\-Timing: dc;desc=atl"
\&  $c\->timing\->server_timing(\*(Aqdc\*(Aq, \*(Aqatl\*(Aq);
\&
\&  # "Server\-Timing: db;desc=Database;dur=0.0001"
\&  $c\->timing\->begin(\*(Aqdatabase_stuff\*(Aq);
\&  ...
\&  my $elapsed = $c\->timing\->elapsed(\*(Aqdatabase_stuff\*(Aq);
\&  $c\->timing\->server_timing(\*(Aqdb\*(Aq, \*(AqDatabase\*(Aq, $elapsed);
\&
\&  # "Server\-Timing: miss, dc;desc=atl"
\&  $c\->timing\->server_timing(\*(Aqmiss\*(Aq);
\&  $c\->timing\->server_timing(\*(Aqdc\*(Aq, \*(Aqatl\*(Aq);
.Ve
.SS "title"
.IX Subsection "title"
.Vb 3
\&  %= title
\&  % title \*(AqWelcome!\*(Aq;
\&  % title \*(AqWelcome!\*(Aq, foo => \*(Aqbar\*(Aq;
.Ve
.PP
Get or set \f(CW\*(C`title\*(C'\fR stash value, all additional key/value pairs get merged into
the \*(L"stash\*(R".
.SS "ua"
.IX Subsection "ua"
.Vb 1
\&  %= ua\->get(\*(Aqmojolicious.org\*(Aq)\->result\->dom\->at(\*(Aqtitle\*(Aq)\->text
.Ve
.PP
Alias for \*(L"ua\*(R" in Mojolicious.
.SS "url_for"
.IX Subsection "url_for"
.Vb 1
\&  %= url_for \*(Aqnamed\*(Aq, controller => \*(Aqbar\*(Aq, action => \*(Aqbaz\*(Aq
.Ve
.PP
Alias for \*(L"url_for\*(R" in Mojolicious::Controller.
.PP
.Vb 1
\&  %= url_for(\*(Aq/index.html\*(Aq)\->query(foo => \*(Aqbar\*(Aq)
.Ve
.SS "url_with"
.IX Subsection "url_with"
.Vb 1
\&  %= url_with \*(Aqnamed\*(Aq, controller => \*(Aqbar\*(Aq, action => \*(Aqbaz\*(Aq
.Ve
.PP
Does the same as \*(L"url_for\*(R", but inherits query parameters from the current
request.
.PP
.Vb 1
\&  %= url_with\->query({page => 2})
.Ve
.SS "validation"
.IX Subsection "validation"
.Vb 1
\&  my $v = $c\->validation;
.Ve
.PP
Get Mojolicious::Validator::Validation object for current request to
validate file uploads as well as \f(CW\*(C`GET\*(C'\fR and \f(CW\*(C`POST\*(C'\fR parameters extracted from
the query string and \f(CW\*(C`application/x\-www\-form\-urlencoded\*(C'\fR or
\&\f(CW\*(C`multipart/form\-data\*(C'\fR message body. Parts of the request body need to be loaded
into memory to parse \f(CW\*(C`POST\*(C'\fR parameters, so you have to make sure it is not
excessively large. There's a 16MiB limit for requests by default.
.PP
.Vb 4
\&  # Validate GET/POST parameter
\&  my $v = $c\->validation;
\&  $v\->required(\*(Aqtitle\*(Aq, \*(Aqtrim\*(Aq)\->size(3, 50);
\&  my $title = $v\->param(\*(Aqtitle\*(Aq);
\&
\&  # Validate file upload
\&  my $v = $c\->validation;
\&  $v\->required(\*(Aqtarball\*(Aq)\->upload\->size(1, 1048576);
\&  my $tarball = $v\->param(\*(Aqtarball\*(Aq);
.Ve
.SH "METHODS"
.IX Header "METHODS"
Mojolicious::Plugin::DefaultHelpers inherits all methods from
Mojolicious::Plugin and implements the following new ones.
.SS "register"
.IX Subsection "register"
.Vb 1
\&  $plugin\->register(Mojolicious\->new);
.Ve
.PP
Register helpers in Mojolicious application.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Mojolicious, Mojolicious::Guides, <https://mojolicious.org>.