I am using rails 3 and fragment cache.
Here is my controller code(show method):
if request.format == 'pdf'
render pdf: #design.slug, layout: 'application'
else
**expire_fragment('design_printed_by')**
#design.add_evaluation(:viewed_count, 1, current_user) if current_user && !current_user.evaluated?(#design, :viewed_count)
respond_with #design
end
And here is my view file code(show.html.slim) :
- cache ['design_printed_by', #design], skip_digest: true do
= render partial: 'printed_by', locals: { design: #design }
But when i add new record, this record is not display on page.
I don't know what i am missing.
Is there anything wrong with this code?
Check this link may it help you.
http://guides.rubyonrails.org/caching_with_rails.html#fragment-caching
Related
I have the following code in my controller
#current_chat = current_user.sent_messages
.where("created_at > ? and receiver_id = ?", current_user.current_sign_in_at, current_chat[:receiver_id].to_i)
.select("body, created_at").each { |message| message.instance_eval { def type; #type end; #type = 'sent' } }
And I'm passing the #current_chat object to a partial like so:
<%= render partial: 'shared/chat_form', locals: { messages: #current_chat } %>
But I'm getting the following error:
singleton can't be dumped
At the first line in ActiveSupport::MessageVerifier#generate
def generate(value)
data = ::Base64.strict_encode64(#serializer.dump(value))
"#{data}--#{generate_digest(data)}"
end
Any ideas on how to fix this?. Thanks in advance.
You can not use this
#serializer.dump(value)
This is causing the error. Read this link, its all about using singletons in ruby.
link
Backstory: I'm building a site that takes in a Soundcloud URL as part of a post. Currently, I store the link they provide and, when a user loads their feed view, I retrieve the associated image / title / favorite count etc. via my post_helper. I have quickly come to realize that this is not scalable and is hurting load times.
So, what I think I should do (feel free to tell me that there is a better way), is to retrieve the SC/YT metadata on form submit and store it along with the other post data (id, user, content etc.) in the posts' table entry. How would I go about calling the helper methods to retrieve such on form submit and include the metadata in the submitted params?
post_helper.rb excerpt:
def soundcloud_info(soundcloud_url, type)
begin
resolve = scClient.get('/resolve', :url => soundcloud_url)
track_info = scClient.get("/tracks/#{resolve.id}")
rescue Soundcloud::ResponseError => e
%Q{ Error: #{e.message}, Status Code: #{e.response.code} }
end
if type == "title"
%Q{#{track_info['title']}}
elsif type == "image"
%Q{#{track_info['artwork_url']}}
elsif type == "favCount"
%Q{Favorite count: #{track_info['favoritings_count']}}
end
end
post_controler.rb excerpt:
def create
#post = current_user.posts.build(params[:post])
if #post.save
flash[:success] = "Your post was successful!"
redirect_to root_url
else
#feed_items = current_user.feed.paginate(page: params[:page])
render 'static_pages/home'
end
end
So apparently it's pretty straight forward... all I need to do is modify the parameters in the controller before I call #post = current_user.posts.build(params[:post]). My issue was that I was trying to do so in the helper.
I haven't quite adapted the whole thing to get all my required fields, but here's an example of how I have adapted the create method to pull the api URL out if someone submits SoundCloud's embed iframe.
micropost_controller.rb excerpt:
def create
#url = params[:post][:link_html]
if #url[/^.*src="(https|http):\/\/w.soundcloud.com\/player\/\?url=(.*)">/]
params[:post][:link_html] = CGI::unescape($2)
end
#post = current_user.posts.build(params[:post])
if #post.save
flash[:success] = "Your post was successful!"
redirect_to root_url
else
#feed_items = current_user.feed.paginate(page: params[:page])
render 'static_pages/home'
end
end
I have been struggling with this for a while. As well as some specific help I would be grateful for some pointers how I may fill some of the gaps in my knowledge. BTW I am new to Rails and web development.
I have used DataTables to display a table records and have some code which shows me the id of the row selected by the user. From within my index view I want to use that row id to load the edit view for that data row. My .js code is as follows:
$(document).ready(function() {
/* Init the table */
TableTools.DEFAULTS.aButtons = [];
oTable = $("#highways").dataTable({
sPaginationType: "full_numbers",
bJQueryUI: true,
"bProcessing": true,
"bServerSide": true,
iDisplayLength: 25,
sAjaxSource: $('#highways').data('source'),
"aoColumns": [
null,
null,
null,
null,
null
],
"sDom": 'T<"clear">lfrtip',
"oTableTools": {
"sRowSelect": "single",
"fnRowSelected": function ( node ) {
var oTT = TableTools.fnGetInstance('highways');
var aData = oTT.fnGetSelectedData();
var n = '/highways/' + aData[0][4] + '/edit'
alert(n);
var jqxhr = $.get(n, function() {
alert("success");
})
}
},
});
} );
The development log shows:
Started GET "/highways/8/edit" for 127.0.0.1 at 2012-08-21 07:57:14 +1000
Processing by HighwaysController#edit as /
Parameters: {"id"=>"8"}
[1m[35mHighway Load (0.3ms)[0m SELECT highways.* FROM highways WHERE highways.id >= 8 LIMIT 1
Highway BARKLY HIGHWAY
Rendered highways/_form.html.erb (67.1ms)
Rendered highways/edit.html.erb within layouts/highways (258.5ms)
Completed 200 OK in 276ms (Views: 274.6ms | ActiveRecord: 0.3ms)
I have tried various things in the controller code, and in some cases the log says the edit view has been renedered but it does not show in the browser. Current controller code:
class HighwaysController < ApplicationController
respond_to :html, :json
def index
# #highways = Highway.all
# logger.debug "Highway Count: #{#highways.size}"
respond_to do |format|
format.html
format.json { render json: HighwaysDatatable.new(view_context) }
end
end
def edit
# logger.debug "Edit (render :layout => false) Highway ID #{params[:id]}"
#highway = Highway.find(params[:id])
logger.debug "Highway #{#highway.name}"
# render
respond_to do |format|
format.html
format.json { render json: HighwaysDatatable.edit(view_context) }
end
Is the $.get returning JSON ?
I have also tried a different approach. I have a link_to in the index view:
<div id ="highway_edit" >
<% #n = 11.to_s %>
<%= link_to "Edit 2", edit_highway_path(#n), :remote => true %>
</div>
This hard coded version works but I could not find a way to modify that link from within the javascript code so that it reflected the selected row id, or to call a function which would return the row id into the variable #n.
I realize that there must be some fundamentals I am missing so some suggested starting points for my education would be appreciated. I have read many other related questions but do not have enough knowledge to extract what I need.
PS I see that DataTables has an Editor feature which does pretty much what I want to achieve in the long run, but it is not 'Rails ready'.
Thanks!
EDIT:
In preparing this question I did not properly restore my code to the stage I wanted to discuss. So I have changed the controller code and the subsequent development log. So instead of a template error the problem is that the view is not rendered.
EDIT
I have proceeded with this problem and now have a result. I added a new div (class of 'result') to the top of my index view and changed my js code as follows:
var n = '/highways/' + aData[0][4] + '/edit'
$.get(n, function(data) {
$('.result').html(data);
and the edit view is rendered in that div. The result is ugly as it pushes the table down and doubles up the DataTable headers and footer. But at least it renders. I don't understand why this works when both ways go via the Edit method in the controller. I can now work on the cosmetics, or better still have the edit view appear as a modal overlay.
I would prefer to be able to click (or preferably double-click) a row and the edit view for that row be loaded. I will continue to look to do it that way. In the meantime I have added a link to the view:
<div id="EditLink">
<%= link_to "Edit Highway", :controller => :highways, :action => :edit, :id => 1 %>
</div>
and have the following code in the call back function:
"oTableTools": {
"sRowSelect": "single",
"fnRowSelected": function(node) {
var oTT = TableTools.fnGetInstance('highways');
var aData = oTT.fnGetSelectedData();
$("div#EditLink a").attr('href','/highways/' + aData[0][4] + '/edit')
}
},
which modifies the link based on the id of the selected row. Using this method the user has to know to first select a row and then click the link. If they do not first select a row they will go to the default (id = 1). You have to make sure that such an id exists in the table.
I have a really simple problem. I have a page of reports and each report has its own tab. I'm using current_page? to determine which tab should be highlighted. When I submit any report, current_page? doesn't seem to work anymore, apparently because the request method is POST.
Is this the intended behavior of current_page? I have a hard time imagining why that would be the case. If it is, how do people normally get around this problem?
Here's an example of a current_page? call:
<li><%= link_to "Client Retention", reports_client_retention_path, :class => current_page?(reports_client_retention_path) ? "current" : "" %></li>
All right, it looks like I figured out the answer to my own question about 5 minutes after putting up a bounty. It looks like current_page? will always return false on POST.
Here's the source code for current_page?:
# File actionpack/lib/action_view/helpers/url_helper.rb, line 588
def current_page?(options)
unless request
raise "You cannot use helpers that need to determine the current " "page unless your view context provides a Request object " "in a #request method"
end
return false unless request.get?
url_string = url_for(options)
# We ignore any extra parameters in the request_uri if the
# submitted url doesn't have any either. This lets the function
# work with things like ?order=asc
if url_string.index("?")
request_uri = request.fullpath
else
request_uri = request.path
end
if url_string =~ %r^\w+:\/\//
url_string == "#{request.protocol}#{request.host_with_port}#{request_uri}"
else
url_string == request_uri
end
end
I don't really understand why they would have gone out of their way to make current_page? work only for GET requests, but at least now I know that that's the way it is.
You could create a new current_path? method in your ApplicationHelper:
def current_path?(*paths)
return true if paths.include?(request.path)
false
end
Pass in one or more paths and it returns true if any match the user's current path:
current_path?('/user/new')
current_path?(root_path)
current_path?(new_user_path, users_path '/foo/bar')
Or, you can create a new current_request? helper method to check the Rails controller + action:
def current_request?(*requests)
return true if requests.include?({
controller: controller.controller_name,
action: controller.action_name
})
false
end
Pass in one or more controller + action and it returns true if any match the user's current request:
current_request?(controller: 'users', action: 'new')
current_request?({controller: 'users', action: 'new'}, {controller: 'users', action: 'create'})
==UPDATE==
Ok, I decided to make using current_request? a little less verbose by not requiring that you type out the controller when you are trying to match multiple actions:
def current_request?(*requests)
requests.each do |request|
if request[:controller] == controller.controller_name
return true if request[:action].is_a?(Array) && request[:action].include?(controller.action_name)
return true if request[:action] == controller.action_name
end
end
false
end
Now you can do this:
current_request?(controller: 'users', action: ['new', 'create'])
I was having the same problem when using POST. My solution was to do something like this
def menu_item link_text, link_path
link_class = (request.original_url.end_with? link_path) ? 'active' : ''
content_tag :li, link_to(link_text, link_path), class: link_class
end
where link_path is just url_for(action: 'action', controller: 'controller')
I am trying to write api code that utilizes the JSON rendered from the controller. I was able to successfully get my desired results locally, but when I push to Heroku parts of my JSON is not rendered correctly.
To put in context, I am trying to create a nested JSON with meal information (name, id, etc) and photo urls. Locally the photo urls render correctly in the JSON. However, on Heroku the photo urls show up as null. On Heroku, I have also tested just rendering the url JSON alone and it is getting the urls correctly.
If you know why it is rendering correctly locally and not on Heroku please let me know. Thank you
I create my JSON the following way:
def api
#meals = Meal.all
#urls = Hash.new
#return_val = Array.new
#sorted_meals = Meal.select('meals.name as meal_name, meals.id as meal_id,
COALESCE(sum(meal_ratings.rating), 0) as meal_rating,
restaurants.id as restaurant_id, restaurants.name as restaurant_name').
joins('LEFT JOIN meal_ratings ON meals.id = meal_ratings.meal_id
LEFT JOIN restaurants ON restaurants.id = meals.restaurant_id').
group('meals.name, meals.id, restaurants.id, restaurants.name').
order('meal_rating DESC').all
#meals.each do |meal|
unless meal.meal_photos.empty?
#urls[meal.id] = {"thumb" => meal.meal_photos[0].photo.url(:thumb), "profile" => meal.meal_photos[0].photo.url(:profile)}
end
end
#sorted_meals.each do |meal|
#return_val.push("id" => meal.meal_id, "name" => meal.meal_name,
"rating" => meal.meal_rating, "restaurant" => meal.restaurant_name,
"restaurant_id" => meal.restaurant_id, "urls" => #urls[meal.meal_id])
end
respond_to do |format|
format.html # show.html.erb
format.json { render json: #return_val } # render json: #url render json: #meals
end
end
The problem was due to Postgres. When I query for a meal_id it returned a string and was not working as a hash key, so I was getting nil. After turning the id string into turn an int everything worked fine. Thanks to the help of Sena this has been resolved.