Add querystring parameters to link to

Question

I m having difficultly adding querystring parameters to link to UrlHelper   I have an Index view  for example  that has UI elements for sorting  filtering  and pagination  via will paginate    The will paginate plugin manages the intra-page persistence of querystring parameters correctly   Is there an automatic mechanism to add the querystring parameters to a give named route  or do I need to do so manually   A great deal of research on this seemingly simple construct has left me clueless   Edit  Some of the challenges    If I have two querystring parameters  bucket  amp  sorting  how do set a specific value to one of these in a link to  while preserving the current value of the other   For example    lt    link to  0   profiles path  bucket   gt   0    sorting  gt        gt   If I have multiple querystring parameters  bucket  amp  sorting  amp  page size  and I want to set the value to one of these  is there a way to  automatically  include the names and values of the remaining parameters   For example    lt    link to  0   profiles path  bucket   gt   0    include sorting and page size name values here      gt   The will paginate plugin manages its page variable and other querystring variables automatically   There doesn t seem to be an automatic UI element for managing page size   While I ve seen code to create a select list of page sizes  I would rather have A elements for this  like SO    Part of this challenge is related to  2  part is related to hiding showing this UI element based on the existence non-existence of records   Said another way  I only want to include page-size links if there are records to page   Moreover  I prefer to automatically include the other QS variables  i e  page  bucket  sorting   rather than having to include them by name in the link to

User · Answer

In case you want to pass in a block  say  for a glyphicon button  as in the following    lt    link to my url  class   stuff  do   gt     lt i class  glyphicon glyphicon-inbox gt  lt  i gt  Nice glyph-button  lt   end   gt    Then passing querystrings params could be accomplished through    lt    link to url for params merge my params   value     class   stuff  do   gt     lt i class  glyphicon glyphicon-inbox gt  lt  i gt  Nice glyph-button  lt   end   gt

User · Answer

If you want the quick and dirty way and don t worry about XSS attack  use params merge to keep previous parameters  e g    lt    link to  Link   params merge   per page   gt  20     gt    see  https   stackoverflow com a 4174493 445908  Otherwise   check this answer  params merge and cross site scripting

User · Answer

If you want to keep existing params and not expose yourself to XSS attacks  be sure to clean the params hash  leaving only the params that your app can be sending     inline  lt    link to  Link   params slice  sort  merge per page  20    gt     nbsp   If you use it in multiple places  clean the params in the controller     your controller rb  params   params slice  sort   per page     view  lt    link to  Link    params merge per page  20    gt

User · Answer

The API docs on link to show some examples of adding querystrings to both named and oldstyle routes   Is this what you want   link to  can also produce links with anchors or query strings   link to  Comment wall   profile path  profile   anchor   gt   wall      gt   lt a href   profiles 1 wall  gt Comment wall lt  a gt   link to  Ruby on Rails search    controller   gt   searches    query   gt   ruby on rails     gt   lt a href   searches query ruby on rails  gt Ruby on Rails search lt  a gt   link to  Nonsense search   searches path  foo   gt   bar    baz   gt   quux      gt   lt a href   searches foo bar amp amp baz quux  gt Nonsense search lt  a gt

[ruby-on-rails] Add querystring parameters to link_to

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