I'm trying to pass the value of a element to a rails controller!
Currently, I have something like this:
<td id="dbname"><%= link_to db, :action => :show %></td>
This represents a row in an html table, which contains a string value, e.g. "development".
When the user clicks on the "development" link, the <%= link_to ... %> grabs the value from the current clicked and passes that to a rails controller action, in this case the show action.
How can this be achieved!?
UPDATE - generating links:
<% #dbs.each do |db| %>
<tr>
<td id="dbname"><%= link_to db, :action => :show %> </td>
</tr>
UPDATE 2:
this is my index controller:
conn = Mongo::Connection.new
#dbs = conn.database_names #this returns an array of strings (which are the names of the databases)
Now I want to be able to click on of these databases and then to pass the clicked text to the rails controller show action. I'm not sure how I would generate a custom resources path for these links... but I was contemplating of doing it using Ajax or something javascript related. Maybe get the text of clicked link using jQuery and then send an Ajax request to the rails controller with the text as a parameter!
I think that it's a strange thing what you're trying to do, but a solution could be to use javascript to append the id to the href of each link as a query string.
If you could explain a little bit what you're trying to achieve maybe we could find a better solution.
Hope it helps!
Edit:
If you have a table of links I think that you should consider them as a resource and managing them the REST way.
Your controller should have an index and show action and you should declare the links as a resource in the routes file (maybe link it's a reserved word and you will have to use a different name, I'm not sure), the index action will fetch all the links and when you render them, you could specify the link for each one with something similar to "link_path(link.id)" (remember, you should have a show action defined) in the controller you will receive the link id so you could load it with a simple "find" and pass it to the view.
I recommend you to always look for the REST way to solve a problem in ROR.
Edit 2:
Ok let's see if this works for you:
I suppose that you have a model that represent those links that you're talkin about, for example:
class DataBaseLinks < ActiveRecord:Base
end
This model with be backed up by a table in your database, if you have generated it the rails way, you will also have an id column that identify each database link.
in your controller, let's say DataBaseLinksController, you'll have:
class DataBaseLinksController < ApplicationController
def index
#dabatase_links = DataBaseLink.all
end
def show
#database_link = DataBaseLink.find(params[:id])
end
end
(I've avoided all the validations and checks).
All you have to do in your index.html.erb is:
<% #database_links.each do |database_link| %>
<%= link_to database_link.name, database_link_path(database_link.id) %>
<% end %>
This will generate all the links with the correct path to the show action (maybe the route helper is a little bit different, but not so much).
Notice also that you'll have to add into your routes.rb the following line:
resources :database_links, :only => [:index, :show]
How do you see it?
Edit 3:
(I'll delete all my edited answers when we find a correct one)
Ok I'm going to suppose that you are not using something like mongoid so you don't have active record similar objects.
Have you tried this in your view:
<% dbs.each do |dbs_name| %>
<%= link_to dbs_name, :controller => "your_controller", :action => :show, :dbs_name => dbs_name %>
<% end %>
Related
I have a model called sections, which has many feedbacks. This is working ok, and on the 'section' show page I can show the associated 'feedbacks' like so:
<% #section.feedbacks.each do |feedback| %>
<%= feedback.name %>
<%= link_to 'Show', feedback %>
<%= link_to 'Edit', edit_feedback_path(feedback) %> |
<% end %>
Works fine. But now I need a button that takes me to the create page for a new feedback item, and it needs to be associated to this 'section'.
At first I did it with a nested form, but the feedback items have quite a lot of fields and so it's messy to do it all on one page.
I'm new to ruby, so hopefully it's a really simple thing!
Thanks in advance for any help,
James
You should use nested form for it. If your form contains many fields then use bootstrap wizard for it.
or
<%= link_to 'New', new_feedback_path(section_id: #section.id) %>
& in your new method of feedback_controller , write the below:
#feedback = Feedback.new
#feedback.section_id = params[:section_id]
What you are trying to do is pretty much standard Rails stuff and you need to read a bit more of the official guides. You will need:
A controller with different actions for feedbacks (edit and new for example)
Some views for the above actions. The edit and new views can share the same form.
Routing to make it possible to work with a Feedback in the context of a Section.
Like:
resources :sections do
resources :feedbacks
end
This will allow you to use the following instead of your edit link:
<%= link_to 'Edit', edit_feedback_path([#section, feedback]) %>
And will go to this edit route:
/sections/:section_id/feedbacks/:feedback_id
You will also have the following new route available:
/sections/:section_id/feedbacks/new
Which will allow you to get the right section from the url params in order to create a feedback for it.
I am a newbie at it.I have just educated myself for 2 days. And a have a problem.
Example: I have a table , called as tblData, includes 2 columns: id, img_link. img_link contains link to an image.
I want to show all of them in this table(id and image, not image link) into a html file.
So, exactly what I need do?
If you have an image link that you can pull from your database, you can do something like this:
Assuming you have an object assigned and everything's set up:
In your controller for tbl_data (e.g. app/controllers/tbl_data_controller.rb):
class TblDataController < ApplicationController
def your_action
#tbl_data_item = TblData.first
end
end
(The code above is just an example, you should substitute for whatever code/query you wish to run)
In your view template, you can render an image from a link using the following Rails view helper:
<%= image_tag(#tbl_data_item.img_link) %>
This would output the following HTML:
<img src="/path/to/image/from/img_link" />
There's a lot more info on this helper on the Rails api docs. The Rails Guides has some awesome info on getting things set up and running as well. Hope this helped!
UPDATE:
To give you a better example with clearer steps, you would do something like the following:
Set up your routes (app/config/routes.rb):
Rails.application.routes.draw do
resources :tbl_data
end
Create your model, used to communicate with its respective database table (app/models/tbl_data.rb):
class TblData < ActiveRecord::Base
# your model-specific code goes here - validations, scopes, etc.
end
Create the controller, which responds to when a user hits a certain route in your app (app/controllers/tbl_data_controller.rb):
class TblDataController < ApplicationController
def your_action
#tbl_data_items = TblData.all
end
end
Create the view template, that will be rendered for your user(app/views/tbl_data/your_action.rb):
<table>
<% #tbl_data_items.each do |item| %>
<tr>
<td><%= item.id %></td>
<td><%= image_tag(item.img_link) %></td>
</tr>
<% end %>
</table>
The above would show a table with each record in the #tbl_data_items as a row, with 2 columns, one with the id, and one with the actual image for that item.
Create a folder in public called images, put the desired image in that folder.
Put <%=image_tag 'whatevertheimagefilenameis.png', class: 'example-class', id: 'example-id'%> in the html.
I'm pretty new to rails and I'd like to set my links for a certain page dynamically. I have a table called "Unfinished" and it has a column called "link" (corrected from "links") I'd like to be able to call the "link" record in the view to set my link_to link path.
I am trying to do this...
<%= link_to #unfinished.link(:p => #post.id) do %> FINISH <% end %>
...but that's not working.
my controller says:
def show
#post = Post.find(params[:id])
#unfinished = Unfinished.where('progress = ?', #post.progress).last
end
and the controller logic works fine...until I try to put the #unfinished.link into link_to
Edit:
Error Message:
wrong number of arguments (1 for 0)
Model
class Unfinished < ActiveRecord::Base
end
The type of links are :
step1_path
step2_path
step3_path
I am making a multipage form that you can save partway through. Based on a value in the #post.progress column (like 1, 2, 3) the correct path to complete the post will be provided (step1_path, step2_path etc...)
try this.
<%= link_to eval(#unfinished.link.to_s) do %> FINISH <% end %>
since the link you want is actually a named route, so you will need to eval it.
but with this you wouldn't be able to be able to pass in the post id, which you will need.
If the route is the same for all records (save for what part you are on based on the progress attribute) do you even need to store it in the database? You could just make the link method return the path (that you would still need to eval).
something like
def link (post)
"step#{self.progress}_path(post.id)"
end
and then eval the link on the way back. but Not sure if that will work, just thinking out loud...
There are gems that do multi-stage forms perhaps looking into them might help?
Hi I'm making a rails app that uses Zendesk API calls. I have a controller that uses two classes I defined
class TicketsController < ApplicationController
require 'ticket_fields'
require 'ticket_search'
def getTickets
#search_fields = SearchFields.new(client)
#tickets = TicketSearch.new(client)
end
def search_tickets
#ddcustomvalues = [params[:customer_company_id], params[:study_id], params[:type_id], params[:system_id]]
#tickets.search_tickets(ddcustomvalues)
end
end
One class SearchFields uses the api to load values I want to filter tickets by into arrays. My view then uses these values to populate drop down lists.
The other class TicketSearch looks like this.
class TicketSearch
attr_reader :tickets, :text
def initialize(client)
#text = "query"
#tickets = Array.new
client.tickets.all do |resource|
#tickets << resource
end
end
def search_tickets(custom_search_fields)
querystring = "type:ticket+tags:"
custom_search_fields.each_with_index do |field, index|
unless field == ""
if index ==0
querystring += "#{field}"
else
querystring += " #{field}"
end
end
end
#text = querystring
end
end
What I want to happen in my view is when a button is pressed it changes the value of #text to the querystring generated by the drop down list options that were selected. I'm currently doing this for testing to see if my querystring is correct and the button works. What I eventually want it to do is send the querystring to the ZenDesk Server and returns the tickets I filtered for. the #tickets array would then be replaced with the filtered tickets the server returned. Currently my button code looks like this.
<%= button_to 'Search', :action => 'search_tickets' %>
with all the route code I've tried I either get an error upon starting the page. Or when I press the button nothing happens and the #text being displayed in my view remains "query". Can someone help explain what I need to do I don't quite understand how routes work.
==================================================================================
Hey so I made the changes you suggested and did some reading up on AJAX and js and I think I'm almost at the answer my view now looks like this
<div id="test" >
<%= render partial: 'text', locals: { text: #tickets.text} %>
<div id="test" >
and I created a partial _text file that looks like this
<p> Query: <%=text%> </p>
and a js file search_tickets.js.erb
$("#test").html("<%= escape_javascript(render partial: 'text', locals: { text: #tickets.text } ) %>");
any idea what may be going wrong everything loads up okay but the text remains the same in the partial i set up when i hit the button still
the console outputs this after the button is hit
ActionController::RoutingError (No route matches [POST] "/tickets/search_tickets"):
so I guess it may actually be a routing error my route looks like this
resources :tickets do
collection do
put :search_tickets
end
end
and the form tag calling the path looks like this
<%= form_tag search_tickets_tickets_path, remote: :true do %>
<table>
<tr>
<td align = "left" valign="middle"> <font size = 4> Customer Company </font> </td>
<td align = "left" valign="middle">
<%= select_tag "customer_company_id", options_for_select(#search_fields.customer_companies), :prompt => "Select One" %>
</td>
</tr>
......
<tr>
<td> </td>
<td align = "left" valign="middle">
<%= submit_tag "Search" %>
</td>
</tr>
</table>
<% end %>
==================================================================================
(Update)
I think I fixed my last problem by changing my form tag to this
<%= form_tag search_tickets_tickets_path(#tickets), method: :put, remote: :true do%>
however now I get this error from the terminal after I hit the button
NoMethodError (undefined method search_ticket' for nil:NilClass):
app/controllers/tickets_controller.rb:15:insearch_tickets'
how would I pass #tickets as a parameter through my route because clearly its not accessible by search_tickets right now as its giving a nil class error.
Variables
when a button is pressed it changes the value of #text to the querystring generated
It looks to me like you're confused with the stateless nature of Rails - in that, just because a view has been rendered doesn't mean the values / variables are still available for use.
It was mentioned in the comments that it seems you're basing a lot on experience with other frameworks / programming patterns. The best way to describe your solution is that Rails has to "refresh" all your variables / values each time it processes a request; consequently meaning that if you send a button request - you'll have to perform the request as if it were the first one
Ajax
The bottom line is that you need to use an ajax request to pull this off.
To do this, you'll be be best creating a form (not just a button_to), as this will give you the ability to send as many params as you want. You should use form_tag:
#config/routes.rb
resources :tickets do
collection do
get :search_tickets
end
end
#view
<%= form_tag tickets_search_tickets_path, remote: :true do %>
... #-> fields for your params
<%= submit_tag "Search" %>
<% end %>
This will give you the ability to define the following in your controller:
#app/controllers/tickets_controller.rb
Class TicketsController < ApplicationController
def search_tickets
#ddcustomvalues = [params[:customer_company_id], params[:study_id], params[:type_id], params[:system_id]]
#tickets.search_tickets(ddcustomvalues)
respond_to do |format|
format.js #-> loads /views/tickets/search_tickets.js.erb
format.html
end
end
end
#app/views/tickets/tickets_search.js.erb
//JS here to manipulate your original page
Requests
The bottom line here is that if you want to "manipulate" your view without refreshing, unlike "native" application frameworks, where you can rely on a persistent state, with Rails, you basically have to construct the request from scratch (IE passing all the params required for the method to run)
I'm trying to hide parts of my views depending on the User role.
So let's say I want only admins to be able to destroy Products. Besides the code in the controller for preventing regular users from destroying records, I would do the following in the view:
<% if current_user.admin? %>
<%= link_to 'Delete', product, method: :delete %>
<% end %>
The previous code works, but it's prone to errors of omission, which may cause regular users to see links to actions they are not allowed to execute.
Also, if I decide later on that a new role (e.g. "moderator") can delete Products, I would have to find the views that display a delete link and add the logic allowing moderators to see it.
And if there are many models that can be deleted only by admin users (e.g. Promotion, User) maitenance of all the ifs would be pretty challenging.
Is there a better way of doing it? Maybe using helpers, or something similar? I'm looking for something maybe like this:
<%= destroy_link 'Delete', product %> # Only admins can see it
<%= edit_link 'Edit', promotion %> # Again, only admins see this link
<%= show_link 'Show', comment %> # Everyone sees this one
I found these two questions that are similar to mine, but none of them answered my question:
Show and hide based on user role in rails
Ruby on Rails (3) hiding parts of the view
I strongly recommend pundit.
It allows you to create "policies" for each model. For your Product model you might have a ProductPolicy that looks something like this
class ProductPolicy < ApplicationPolicy
def delete?
user.admin?
end
end
In your view you can do something like this
<% if policy(#post).delete? %>
<%= link_to 'Delete', product, method: :delete %>
<% end %>
If later on you want to add a moderator role, just modify the policy method
class ProductPolicy < ApplicationPolicy
def delete?
user.admin? || user.moderator?
end
end
So I kind of figured a way to move the IFs out of the view. First, I override the link_to helper in my application_helper.rb:
def link_to(text, path, options={})
super(text, path, options) unless options[:admin] and !current_user.admin?
end
Then on my views I use it as:
<%= link_to 'Edit Product', product, admin: true, ... %>
This prevents regular users from seeing admin links, but for other html tags with content inside, such as divs, tables etc., an if would still be needed.
CanCan is another gem that lets you define "Abilities" per user role.
In views you can use something like if can? :delete, #post to check if the
user may delete that specific post.
Using the CanCan and Role gems, what is still needed is a way to Check The Route and see if "current_user" has permissions to access that Route based on their role(s) - then show/hide based on that.
This saves the user clicking on things and getting told they cannot see it - or us having to write per-item "if" logic specifying what roles can see what list-items (which the customer will change periodically, as roles are changed/refined) around every single link in one's menu (consider a bootstrap menu with 50+ items nested in groups with html formatting, etc), which is insane.
If we must put if-logic around each menu-item, let's use the exact same logic for every item by checking the role/permissions we already defined in the Ability file.
But in our menu-list, we have route-helpers - not "controller/method" info, so how to test the user's ability to hit the controller-action specified for the "path" in each link?
To get the controller and method (action) of a path (my examples use the 'users_path' route-helper) ...
Rails.application.routes.recognize_path(app.users_path)
=> {:controller=>"users", :action=>"index"}
Get just the controller-name
Rails.application.routes.recognize_path(app.users_path)[:controller]
=> "users"
Ability uses the Model for its breakdown, so convert from controller name to it's model (assuming default naming used) ...
Rails.application.routes.recognize_path(app.users_path)[:controller].classify
=> "User"
Get just the action-name
Rails.application.routes.recognize_path(app.users_path)[:action]
=> "index"
And since the "can?" method needs a Symbol for the action, and Constant for the model, for each menu-item we get this:
path_hash = Rails.application.routes.recognize_path(app.users_path)
model = path_hash[:controller].classify.constantize
action = path_hash[:action].to_sym
Then use our existing Abilty system to check if the current_user can access it, we have to pass the action as a symbol and the Model as a constant, so ...
<% if can? action model %>
<%= link_to "Users List", users_path %>
<% end %>
Now we can change who can see this resource and link from the Ability file, without ever messing with the menu, again. But to make this a bit cleaner, I extracted out the lookup for each menu-item with this in the app-controller:
def get_path_parts(path)
path_hash = Rails.application.routes.recognize_path(path)
model_name = path_hash[:controller].classify.constantize
action_name = path_hash[:action].to_sym
return [model_name, action_name]
end
helper_method :get_path_parts
... so I could do this in the view (I took out all the html-formatting from the links for simplicity, here):
<% path_parts = get_path_parts(users_path); if can?(path_parts[1], path_parts[0]) %>
<%= link_to "Users Listing", users_path %>
<% end %>
... and to make this not take all day typing these per-menu-item if-wraps, I used regex find/replace with capture and wildcards to wrap this around every list-item in the menu-item listing in one pass.
It's far from ideal, and I could do a lot more to make it much better, but I don't have spare-time to write the rest of this missing-piece of the Role/CanCan system. I hope this part helps someone out.