link-to

问题 I'm stuck in a problem which can't be that complicated, but I'm just not getting things right. Assuming I've got two Models: class Notification < ActiveRecord::Base belongs_to :device validates :number, presence: true end and class Device < ActiveRecord::Base belongs_to :user has_many :notifications, :dependent => :destroy //rest omitted for brevity end with nested routes like so: resources :devices do resources :notifications end and a notifications controller like so: class

问题 I'm experiencing some unusual behaviour with my Rails 4 Application. Every single-time I click on a link_to inside my views, my controllers actions are being called twice. For example: In my root_url I have this standard call for users_profile : <%= link_to('User Profile', users_profile_path, :class => "logout-button") %> When I click this link, my console shows the following output: Started GET "/users/profile" for 127.0.0.1 at 2013-11-25 20:45:53 -0200 Processing by Users:

问题 I'm writing a ruby-on-rails library module: module Facets class Facet attr_accessor :name, :display_name, :category, :group, :special ... URI = {:controller => 'wiki', :action => 'plants'} SEARCH = {:status => WikiLink::CURRENT} #Parameters is an hash of {:field => "1"} values def render_for_search(parameters) result = link_to(display_name, URI.merge(parameters).merge({name => "1"})) count = WikiPlant.count(:conditions => (SEARCH.merge(parameters.merge({name => "1"})))) result << "(#{count})"

问题 I know this is probably a pretty simple concept. I am trying to create a link to a controller and action. For example I have a link in my layout file to update a record when a link is clicked, so I need to be able to link to the controller and action. How would I accomplish this? 回答1: link_to "Label", :controller => :my_controller, :action => :index See url_for. 回答2: Also with CSS: <%= link_to "Purchase", { :controller => :transactions, :action => :purchase }, { class: "btn btn-primary btn-lg

问题 A quick and easy answer I'm sure. I'm upgrading a Rails project from version 2 to version 3 and replacing a load of the link_to_remote with link_to's as per the Rails 3 update. Even something as simple as : <%= link_to "Check Time", {:action=>:get_time}, :remote=>true, :update=>'current_time' %> <div id='current_time'></div> doesn't seem to work. The request (using get method) is going through ok and the rendered html is : <a href="/monitoring/get_time" data-remote="true" update="current_time

问题 I'm facing the following problem: I have a very small image gallery with image files located in the following directories app/assets/images/locale/thumbs/ app/assets/images/locale/big/ I have to create a hyperlink that as a content has a thumb image and as a target - its bigger version from app/assets/images/locale/big/ folder: <a href="path-to-full-size-image-001.jpg"> <img alt="first photo preview" src="/assets/locale/thumbs/001.jpg" /> </a> I'm doing this by means of = link_to(image_tag(

问题 I'm trying to build a form that allows a user to add products to an order. The way I have it setup so far is that a user will select from 2 dropdown boxes and type into 1 text field 1 - the product they want 2 - its size 3 - the quantity they want. What I hope to do is have the user click a link_to tag to "Add" this item to their order. I was thinking I could do this via ajax and build the associative record in my controller and have it render on the page when the request returns. When the

问题 I want to make a fairly straightforward image link that uses an image from my assets. Getting weird errors. First I tried: <%= link_to assets_path "town.png", 'index' %> and got the error Started GET "/" for 127.0.0.1 at Wed Nov 30 17:27:10 -0500 2011 Processing by PagesController#intro as HTML Rendered pages/intro.html.erb within layouts/application (114.9ms) Completed 500 Internal Server Error in 124ms ActionView::Template::Error (undefined method `assets_path' for #<#<Class:0x10fdc4898>

问题 I have an image of a map.png file on part of a page. I would like this image to be clickable, and then to download the pdf version of that image. I've been using this as a reference Rails 3.1, can't make link_to image_path?, but I'm not sure how to proceed. It looks like I also need to edit something with the way the page is routed. Thanks for all the help! 回答1: Do you have a route to the pdf download or is the file itself a static asset? You can use a standard link_to helper with an image

问题 When I use link_to helper in Rails 3.0.7 app with many parameters, it generates a lexicographically sorted url as probably mentioned in the to_param method for Hash in Activesupport documentation. e.g. link_to "my Link", {:u=>"user", :q=>"some query", :page=>"4"} generates "/search?page=4&q=some+query&u=user" but what i want is "/search?u=user&q=some+query&page=4" Anyone able to do custom sorting as supplied in the params hash to link_to or url_for ? Unless I am missing something, this seems