Capturing URL parameters in request GET

Question

I am currently defining regular expressions in order to capture parameters in a URL  as described in the tutorial  How do I access parameters from the URL as part the HttpRequest object  My HttpRequest GET currently returns an empty QueryDict object  I d like to learn how to do this without a library  so I can get to know Django better

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Using GET  request GET  id     Using POST  request POST  id

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I would like to share a tip that may save you some time  If you plan to use something like this in your urls py file   url r    P lt username gt  w       views profile page      Which basically means www example com  lt username gt   Be sure to place it at the end of your URL entries  because otherwise  it is prone to cause conflicts with the URL entries that follow below  i e  accessing one of them will give you the nice error  User matching query does not exist   I ve just experienced it myself  hope it helps

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To do this  simply type this in javascript  function getParams url        var params           var parser   document createElement  a        parser href   url      var query   parser search substring 1       var vars   query split   amp         for  var i   0  i  lt  vars length  i              var pair   vars i  split               params pair 0     decodeURIComponent pair 1              return params     var url   window location href  getParams url

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Someone would wonder how to set path in file urls py  such as domain search  q CA  so that we could invoke query  The fact is that it is not necessary to set such a route in file urls py  You need to set just the route in urls py  urlpatterns         path  domain search    views CityListView as view        And when you input http   servername port domain search  q CA  The query part   q CA  will be automatically reserved in the hash table which you can reference though request GET get  q   None    Here is an example  file views py  class CityListView generics ListAPIView       serializer class   CityNameSerializer      def get queryset self           if self request method     GET               queryset   City objects all               state name   self request GET get  q   None              if state name is not None                  queryset   queryset filter state  name state name              return queryset  In addition  when you write query string in the URL  http   servername port domain search  q CA  Do not wrap query string in quotes  For example  http   servername port domain search  q  quot CA quot

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If you only have access to the view object  then you can get the parameters defined in the URL path this way  view kwargs get  url param    If you only have access to the request object  use the following  request resolver match kwargs get  url param    Tested on Django 3

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If you don t know the name of params and want to work with them all  you can use request GET keys   or dict request GET  functions

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This is another alternate solution that can be implemented  In the URL configuration  urlpatterns    path  runreport  lt str queryparams gt    views get    In the views  list2   queryparams split  quot  amp  quot

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You have two common ways to do that in case your URL looks like that  https   domain method  a x amp b y  Version 1  If a specific key is mandatory you can use  key a   request GET  a    This will return a value of a if the key exists and an exception if not  Version 2  If your keys are optional  request GET get  a    You can try that without any argument and this will not crash  So you can wrap it with try  except  and return HttpResponseBadRequest   in example  This is a simple way to make your code less complex  without using special exceptions handling

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def some view request   args    kwargs       if kwargs get  q   None             Do something here

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You might as well check request META dictionary to access many useful things like PATH INFO  QUERY STRING   for example request META  QUERY STRING      or to avoid any exceptions provide a fallback  request META get  QUERY STRING   False    you said that it returns empty query dict I think you need to tune your url to accept required or optional args or kwargs Django got you all the power you need with regrex like  url r  project config   P lt product gt  w       views foo     more about this at django-optional-url-parameters

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For situations where you only have the request object you can use request parser context  kwargs    your param

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When a URL is like domain search  q haha  you would use request GET get  q        q is the parameter you want  and    is the default value if q isn t found  However  if you are instead just configuring your URLconf    then your captures from the regex are passed to the function as arguments  or named arguments   Such as   r  user   P lt username gt  w 0 50       views profile page     Then in your views py you would have def profile page request  username         Rest of the method

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This is not exactly what you asked for  but this snippet is helpful for managing query strings in templates

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These queries are currently done in two ways  If you want to access the query parameters  GET  you can query the following   http   myserver port resource  status 1   request query params get  status   None    gt  1   If you want to access the parameters passed by POST  you need to access this way   request data get  role   None    Accessing the dictionary  QueryDict  with  get     you can set a default value  In the cases above  if  status  or  role  are not informed  the values   are None

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To clarify camflan s explanation  let s suppose you have   the rule url regex r  user   P lt username gt  w 1 50       view  views profile page   a in incoming request for http   domain user thaiyoshi  message Hi   The URL dispatcher rule will catch parts of the URL path  here  user thaiyoshi    and pass them to the view function along with the request object   The query string  here message Hi  is parsed and parameters are stored as a QueryDict in request GET  No further matching or processing for HTTP GET parameters is done   This view function would use both parts extracted from the URL path and a query parameter   def profile page request  username None       user   User objects get username username      message   request GET get  message     As a side note  you ll find the request method  in this case  GET   and for submitted forms usually  POST   in request method  In some cases it s useful to check that it matches what you re expecting   Update  When deciding whether to use the URL path or the query parameters for passing information  the following may help    use the URL path for uniquely identifying resources  e g   blog post 15   not  blog posts  id 15  use query parameters for changing the way the resource is displayed  e g   blog post 15  show comments 1 or  blog posts 2008  sort by date amp direction desc to make human friendly URLs  avoid using ID numbers and use e g  dates  categories and or slugs   blog post 2008 09 30 django-urls

[django] Capturing URL parameters in request.GET

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