JS Richiesta di essere chiamato due volte di seguito

Question

Sto lavorando al tutorial di Ruby on Rails. Ho i pulsanti di seguito asincroni che funzionano. È interessante notare che ciascuna delle chiamate JavaScript viene chiamata due volte di fila quando faccio clic sul pulsante. Qualche idea su come lo faccio inviare solo una richiesta? Ecco il mio registro

Started POST "/tag_user_relationships/123" for
127.0.0.1 at 2011-06-13 21:18:59 -0700   Processing by TagUserRelationshipsController#destroy as JS   Parameters: {"utf8"=>"✓", "authenticity_token"=>"goedvibRxKtDRiAufp1ThWJP0rRBU2cMH2xp7qodKws=", "commit"=>"Unfollow", "id"=>"123"}   User Load (0.2ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 2 LIMIT 1   TagUserRelationship Load (0.2ms)  SELECT `tag_user_relationships`.* FROM `tag_user_relationships` WHERE `tag_user_relationships`.`id` = 123 LIMIT 1   Tag Load (0.2ms)  SELECT `tags`.* FROM `tags` WHERE `tags`.`id`
= 9 LIMIT 1   TagUserRelationship Load (0.3ms)  SELECT `tag_user_relationships`.* FROM `tag_user_relationships` WHERE `tag_user_relationships`.`tag_id` = 9 AND (`tag_user_relationships`.user_id
= 2) LIMIT 1   SQL (0.1ms)  BEGIN   AREL (0.2ms)  DELETE FROM `tag_user_relationships` WHERE `tag_user_relationships`.`id` = 123   SQL (0.4ms)  COMMIT   SQL (0.4ms)  SELECT COUNT(*) FROM `users` INNER JOIN `tag_user_relationships` ON `users`.id = `tag_user_relationships`.user_id WHERE ((`tag_user_relationships`.tag_id = 9))   SQL (0.3ms)  SELECT COUNT(*) FROM `tags` INNER JOIN `tag_user_relationships` ON `tags`.id
= `tag_user_relationships`.tag_id WHERE ((`tag_user_relationships`.user_id = 2)) Rendered tag_user_relationships/_form.js.erb (15.8ms) Rendered tags/_follow.html.erb (2.1ms) Rendered tag_user_relationships/destroy.js.erb (20.3ms) Completed 200 OK in 138ms (Views: 28.1ms | ActiveRecord: 2.3ms)


Started POST "/tag_user_relationships/123" for
127.0.0.1 at 2011-06-13 21:18:59 -0700   Processing by TagUserRelationshipsController#destroy as JS   Parameters: {"utf8"=>"✓", "authenticity_token"=>"goedvibRxKtDRiAufp1ThWJP0rRBU2cMH2xp7qodKws=", "id"=>"123"}   User Load (0.2ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 2 LIMIT 1   TagUserRelationship Load (0.2ms)  SELECT `tag_user_relationships`.* FROM `tag_user_relationships` WHERE `tag_user_relationships`.`id` = 123 LIMIT 1 Completed 404 Not Found in 70ms

ActiveRecord::RecordNotFound (Couldn't find TagUserRelationship with ID=123): app/controllers/tag_user_relationships_controller.rb:14:in `destroy'

Rendered /Users/me/.rvm/gems/ruby-1.9.2-p136@rails3tutorial/gems/actionpack-3.0.8/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.0ms) Rendered /Users/me/.rvm/gems/ruby-1.9.2-p136@rails3tutorial/gems/actionpack-3.0.8/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (153.6ms) Rendered /Users/me/.rvm/gems/ruby-1.9.2-p136@rails3tutorial/gems/actionpack-3.0.8/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (160.2ms)

Ed ecco il mio punto di vista

$("#<%= "follower_info#{@tag.id}" %>").html("<%=escape_javascript(pluralize(@tag.followers.count,'follower'))%>");     
var link = $('<a>').attr('href',"<%=user_tags_path(current_user) %>").text("<%= escape_javascript(pluralize(current_user.beats.count,'tag')) %>");
$("#<%= "user#{current_user.id}_following" %>").html(link); $("#<%= "follow_form#{@tag.id}" %>").html("<%= escape_javascript("#{render('tags/unfollow', :tag => @tag)}").html_safe %>");

E il mio controller

  def create
    @tag = Tag.find(params[:tag_user_relationship][:tag_id])
    current_user.follow_tag!(@tag)
    respond_to do |format|
      format.html { redirect_to @tag }
      format.js
    end   
  end

Answer 1

Ho avuto lo stesso problema di recente. C'è qualche possibilità che tu abbia installato la gemma Ajax e abbia anche incluso il codice jQuery nella cartella JavaScripts? In tal caso, le chiamate verranno effettuate due volte.