Question

How might one use the url_for or link_to helpers to create a link to the same page passing along all GET parameters?

I have a search page which accepts multiple parameters as filters to hide certain results. For example, search.html?query=abc&people=1&groups=0 would search for all items containing ‘abc’ that aren’t groups. I would therefore like a link which toggles these filters, passing the rest of the parameters unchanged to the current page. In the above example, links would be created to search.html?query=abc&people=1&groups=1 and search.html?query=abc&people=0&groups=0.

I am wondering if there is any way to specify ‘this’ as a route, such that if the route or page changed, the code wouldn’t have to.

Moreover, how can one pass all parameters to the helper? $sf_params can be used to access all the parameters, and the ‘query_string’ property can be passed to the helper, but is there any method of combining the two short of creating the string manually?

Answer 1

GET parameters can be passed to a link_to method as an array in the third argument, or url_for in the second. This is illustrated as follows:

link_to('Text to display', 'routename', array('group' => 0, 'people' => 1), $link_attributes);
url_for('routename', array('group' => 0, 'people' => 1));

This is hidden in the source code. Here, $params is the list of GET parameters, and $options HTML attributes to add to the tag.

function link_to2($name, $routeName, $params, $options = array())
function url_for2($routeName, $params = array(), $absolute = false)

The $sf_params function can be converted to a suitable array for passing with getAll(). See the documentation here. Note that this is different from previous versions of Symfony. Also be aware you might have to call getRawValue() from within a template:

$params = $sf_params->getRawValue()->getAll();

$sf_context->getInstance()->getRouting()->getCurrentRouteName() can then be passed as $routeName to get the current route. Thanks to Tom for this