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  • Simple cropping with Paperclip

    - by collimarco
    I would like to crop images on upload using Paperclip to get square thumbs from the center of the original picture. I find out a method in documentation that seems to do exactly what I want: transformation_to(dst, crop = false) The problem is that I can't figure out where to use this method. It would be great to simply pass something as a parameter here: has_attached_file :picture, :styles = { :medium = "600x600", :thumb = "something here" }

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  • RJS in controller

    - by Jamal Abdul Nasir
    i have put the following rjs in a controller... but it gives me the following error... TypeError: Element.update is not a function respond_to do |format| format.js do responds_to_parent do render :update do |page| page.replace_html 'errorLay', :text => "Page with the same name already exists." page.show 'errorLay' page.delay(2) do page.hide 'errorLay' end end end end end so how can i get rid of this error...?

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  • Why does the OAuth Unauthorized Error (401) happen?

    - by ming yeow
    Sometimes an Twitter OAuth is successfully executed, but an unauthorized error is thrown. I get about 50 of these on a daily basis. It is worrying, because I have no idea how that might be reproduced. What are the different cases where this error happens, and how can this be fixed or prevented?

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  • Get used color names from image

    - by atmorell
    Hello, I would like to check what colors is present in a image. This will be stored in the database and used for a search form. (red=1, green=1, blue=0, yellow=1, black=1, white=1 etc.) img = Magick::Image.read('phosto-file.jpg').first img = img.quantize(10 h = img.color_histogram pp h {red=12815, green=18494, blue=15439, opacity=0=>13007, red=44662, green=47670, blue=51967, opacity=0=>18254, red=17608, green=43331, blue=48321, opacity=0=>11597, red=21105, green=25865, blue=39467, opacity=0=>10604, red=15125, green=36629, blue=22824, opacity=0=>10223, red=52102, green=42405, blue=10063, opacity=0=>12928, red=39043, green=28726, blue=40855, opacity=0=>7728, red=10410, green=8880, blue=7826, opacity=0=>13795, red=25484, green=25337, blue=24235, opacity=0=>7351, red=44485, green=12617, blue=11169, opacity=0=>14513} How do I convert the 10 values to color names? red, green, NOMATCH, yellow, black, white etc. Only need the rough color name - not LimeGreen but Green etc. Best regards. Asbjørn Morell

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  • Running tasks in the background with lower CPU priority

    - by Brendon Muir
    I have a feature in my CMS that allows a user to upload a zip file full of images and the server will extract them and insert each one into an image gallery. I've noticed that this grinds up the CPU quite severely and causes other requests to slow down. I'm thinking of using the delayed_job plugin to delegate each image addition into the background, but I also want to give that process a lower CPU priority so that it doesn't bog down the server. I'm pretty confident in the delaying part of the exercise, but the throttling part is where I'm stuck. Is there a ruby way of lowering the priority of a method call? It's the image resizing that causes the CPU chew. Any ideas welcome :)

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  • Pair of blocks in each?

    - by Aleksandr Koss
    As in the standart cycle: - @goods.each do |good| ??? ...to organize this (HAML): .columns-wrapper .column First good .column Second good .column Third good .columns-wrapper .column Fourth good .column Fifth good .column Sixth good

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  • Setting up basic email client for a website

    - by Trip
    I have a simple website. I would like to have a notifier auto reply to folks who signup for different things. Do I have to pay for an SMTP service for this, or is there a simpler free alternative I can use? In short : I know of google apps, authSMTP, sendGrid, mailChimp..but I was wondering if there is something simple I can use

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  • How do I set default search conditions with Searchlogic?

    - by Danger Angell
    I've got a search form on this page: http://staging-checkpointtracker.aptanacloud.com/events If you select a State from the dropdown you get zero results because you didn't select one or more Event Division (checkboxes). What I want is to default the checkboxes to "checked" when the page first loads...to display Events in all Divisions...but I want changes made by the user to be reflected when they filter. Here's the index method in my Events controller: def index @search = Event.search(params[:search]) respond_to do |format| format.html # index.html.erb format.xml { render :xml => @events } end end Here's my search form: <% form_for @search do |f| %> <div> <%= f.label :state_is, "State" %> <%= f.select :state_is, ['AK','AL','AR','AZ','CA','CO','CT','DC','DE','FL','GA','HI','IA','ID','IL','IN','KS','KY','LA','MA','MD','ME','MI','MN','MO','MS','MT','NC','ND','NE','NH','NJ','NM','NV','NY','OH','OK','OR','PA','RI','SC','SD','TN','TX','UT','VA','VT','WA','WI','WV','WY'], :include_blank => true %> </div> <div> <%= f.check_box :division_like_any, {:name => "search[:division_like_any][]"}, "Sprint", :checked => true %> Sprint (2+ hours)<br/> <%= f.check_box :division_like_any, {:name => "search[:division_like_any][]"}, "Sport" %> Sport (12+ hours)<br/> <%= f.check_box :division_like_any, {:name => "search[:division_like_any][]"}, "Adventure" %> Adventure (18+ hours)<br/> <%= f.check_box :division_like_any, {:name => "search[:division_like_any][]"}, "Expedition" %> Expedition (48+ hours)<br/> </div> <%= f.submit "Find Events" %> <%= link_to 'Clear', '/events' %> <% end %>

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  • Getting proper indentation using XMLBuilder in a helper

    - by Robbie
    I'm attempting to use a view helper to create some dynamic links based on if you're logged in or not. What I want returned, for sake of easy code readability, is: <ul class="right"> <li><a href="#">Login</a></li> <li><a href="#">Register</a></li> </ul> In the view helper I have this Ruby code: def loginh xm = Builder::XmlMarkup.new(:indent=>2, :margin=>4) xm.ul("class" => "right") { xm.li('class' => 'text') { xm.text("test") } } end In the view, the line that calls login helper is already indented 4 levels. Because of this, the first line gets 'skewed', so in the view I have: <%= loginh %> Which results in: <ul class="right"> <li class="text"> <text>test</text> </li> </ul> You can see it works perfectly, except for the first line. It would appear that the first line is affected by the indent before <%= loginh % is called. I can easily remedy this by removing the indentation prior to <%= loginh % - but in essence I'd be sacrificing code readability for markup readability. Which isn't what I'm looking to do. Is there any way I could remove the beginning whitespace?

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  • secure rest API for running user "apps" in an iframe

    - by Brian Armstrong
    I want to let users create "apps" (like Facebook apps) for my website, and I'm trying to figure out the best way to make it secure. I have a REST api i want to run the user apps in an iframe on my own site (not a safe markup language like FBML) I was first looking at oAuth but this seems overkill for my solution. The "apps" don't need to be run on external sites or in desktop apps or anything. The user would stay on my site at all times but see the user submitted "app" through the iframe. So when I call the app the first time through the iframe, I can pass it some variables so it knows which logged in user is using it on my site. It can then use this user session in it's own API calls to customize the display. If the call is passed in the clear, I don't want someone to be able to intercept the session and impersonate the user. Does anyone know a good way to do this or good write up on it? Thanks!

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  • RESTful Question/Answer design?

    - by Kirschstein
    This is a toy project I'm working on at the moment. My app contains questions with multiple choice answers. The question url is in the following format, with GET & POST mapping to different actions on the questions controller. GET: url.com/questions/:category/:difficulty => 'ask' POST: url.com/questions/:category/:difficulty => 'answer' I'm wondering if it's worth redesigning this into a RESTful style. I know I'd need to introduce answers as a resource, but I'm struggling to think of a url that would look natural for answering that question. Would a redesign be worthwhile? How would you go about structuring the urls?

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  • Force max length for string in PostgreSQL

    - by Jimmy
    Hey guys, I am using heroku for a RoR application and am trying to manually set the length of a string column and am having trouble. I tried making a migration along the lines of change_column :posts, :content, :string, :length => 10000 I assumed this would work but no such luck, anyone have some pointers? Thanks!

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  • smarter character replacement using ruby gsub and regexp

    - by agriciuc
    Hi guys! I'm trying to create permalink like behavior for some article titles and i don't want to add a new db field for permalink. So i decided to write a helper that will convert my article title from: "O "focoasa" a pornit cruciada, împotriva barbatilor zgârciti" to "o-focoasa-a-pornit-cruciada-impotriva-barbatilor-zgarciti". While i figured out how to replace spaces with hyphens and remove other special characters (other than -) using: title.gsub(/\s/, "-").gsub(/[^\w-]/, '').downcase I am wondering if there is any other way to replace a character with a specific other character from only one .gsub method call, so I won't have to chain title.gsub("a", "a") methods for all the UTF-8 special characters of my localization. I was thinking of building a hash with all the special characters and their counterparts but I haven't figured out yet how to use variables with regexps. What I was looking for is something like: title.gsub(/\s/, "-").gsub(*replace character goes here*).gsub(/[^\w-]/, '').downcase Thanks!

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  • Named Blueprints with factory_girl

    - by Jason Nerer
    I am using Factory Girl but like the machinist syntax. So I wonder, if there is any way creating a named blueprint for class, so that I can have something like that: User.blueprint(:no_discount_user) do admin false hashed_password "226bc1eca359a09f5f1b96e26efeb4bb1aeae383" is_trader false name "foolish" salt "21746899800.223524289203464" end User.blueprint(:discount_user) do admin false hashed_password "226bc1eca359a09f5f1b96e26efeb4bb1aeae383" is_trader true name "deadbeef" salt "21746899800.223524289203464" discount_rate { DiscountRate.make(:rate => 20.00) } end DiscountRate.blueprint do rate {10} not_before ... not_after ... end Is there a way making factory_girl with machinist syntax acting like that? I did not find one. Help appreciated. Thx in advance Jason

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  • Base-camp Style Subdomains and IDs of Models

    - by Newy
    I have an app that has Basecamp-style subdomains, that is, I have Projects, Users, Apples and Oranges. The Users, Apples and Oranges are all keyed to a Project and only exist in the http://project.myapp.com. I added a project_id to Users, Apples and Oranges and everything works, except of course that the ids of those three objects increment globally, and throughout my app I lookup objects by that id. This doesn't seem like best practice. Should I instead do lookups by a secondary key? How does that affect efficiency? If there's a good blog post that covers this, would be wesome.

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  • "Invite your friends" feature in RoR

    - by Nisanio
    Hi, many social networks let to invite your gmail-hotmail-yahoo friends (even Outlook, but I thinks that is more difficult) to the social network. Basically the app read your email friends list and sent a email invitation. How can I achieve this in RoR? Thanks

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  • searchlogic and virtual attributes

    - by Ermin
    Let's say I have the following model: Person <AR def name [self.first_name,self.middle_name,self.last_name].select{|n| n.present?}.join(' ') end end How could I do a search on the virtual attribute with searchlogic, something like: Person.search.name_like 'foo' Of courese I could construct a large statement like: Person.search.first_name_like_or_last_name_like_or_... 'argh' but surely there is a more elegant way.

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  • ActiveScaffold complains about association

    - by Bilal Aslam
    I'm using ActiveScaffold to create an Admin UI. I have two models: Post and Comments. A Post has-many Comments, and a Comment belongs-to a post. There's a validates_presences_of :text validation the Comment model. The problem is that when I create a new Post from the Admin UI without creating a new Comment in the subform, ActiveScaffold complains about the validation. I can create the Post if I also create a Comment associated with it, which is not what I Want. I can create a new Post manually from script/console. What gives?

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  • Internet Radio Station for University

    - by ryan
    I am trying to help my University Student Radio station rethink the setup of the way they stream music, but I have some questions regarding the use of Ubuntu to stream music. Currently, the radio station uses two windows machines: one of which is used to stream the radio station and serve the website, and the other is used by rotating djs to select songs and create playlists. The computer used by djs feeds mono into the sound card of the server and the server streams the feed online. -Ideally I would like to maintain a two-computer setup: One computer as server, and another that is used to select and play music by rotating djs. -I would like to use Ubuntu for the server. -I would like to use Windows for the other machine. -The server should be able to stream song information. First, is there a way to somehow get the song information from an analog feed? Second, what is the best streaming server for radio? I have encountered shoutcast, icecast, and darwin, but I don't know where to begin in attempting to gauge them. Finally, if anyone has any tips or pointers about small internet radio station management/ setup they would be appreciated as this is my first radio station, and I am eager to hear of past experiences.

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  • Using RJS to replace innerHTML with a real live instance variable.

    - by Steve Cotner
    I can't for the life of me get RJS to replace an element's innerHTML with an instance variable's attribute, i.e. something like @thing.name I'll show all the code (simplified from the actual project, but still complete), and I hope the solution will be forehead-slap obvious to someone... In RoR, I've made a simple page displaying a random Chinese character. This is a Word object with attributes chinese and english. Clicking on a link titled "What is this?" reveals the english attribute using RJS. Currently, it also hides the "What is this?" link and reveals a "Try Another?" link that just reloads the page, effectively starting over with a new random character. This is fine, but there are other elements on the page that make their own database queries, so I would like to load a new random character by an AJAX call, leaving the rest of the page alone. This has turned out to be harder than I expected: I have no trouble replacing the html using link_remote_to and page.replace_html, but I can't get it to display anything that includes an instance variable. I have a Word resource and a Page resource, which has a home page, where all this fun takes place. In the PagesController, I've made a couple ways to get random words. Either one works fine... Here's the code: class PagesController < ApplicationController def home all_words = Word.find(:all) @random_word = all_words.rand @random_words = Word.find(:all, :limit => 100, :order => 'rand()') @random_first = @random_words[1] end end As an aside, the SQL call with :limit => 100 is just in case I think of some way to cycle through those random words. Right now it's not useful. Also, the 'rand()' is MySQL specific, as far as I know. In the home page view (it's HAML), I have this: #character_box = render(:partial => "character", :object => @random_word) if @random_word #whatisthis = link_to_remote "? what is this?", :url => { :controller => 'words', :action => 'reveal_character' }, :html => { :title => "Click for the translation." } #tryanother.{:style => "display:none"} = link_to "try another?", root_path Note that the #'s in this case represent divs (with the given ids), not comments, because this is HAML. The "character" partial looks like this (it's erb, for no real reason): <div id="character"> <%= "#{@random_word.chinese}" } %> </div> <div id="revealed" style="display:none"> <ul> <li><span id="english"><%= "#{@random_word.english_name}" %></span></li> </ul> </div> The reveal_character.rjs file looks like this: page[:revealed].visual_effect :slide_down, :duration => '.2' page[:english].visual_effect :highlight, :startcolor => "#ffff00", :endcolor => "#ffffff", :duration => '2.5' page.delay(0.8) do page[:whatisthis].visual_effect :fade, :duration => '.3' page[:tryanother].visual_effect :appear end That all works perfectly fine. But if I try to turn link_to "try another?" into link_to_remote, and point it to an RJS template that replaces the "character" element with something new, it only works when I replace the innerHTML with static text. If I try to pass an instance variable in there, it never works. For instance, let's say I've defined a second random word under Pages#home... I'll add @random_second = @random_words[2] there. Then, in the home page view, I'll replace the "try another?" link (previously pointing to the root_path), with this: = link_to_remote "try another?", :url => { :controller => 'words', :action => 'second_character' }, :html => { :title => "Click for a new character." } I'll make that new RJS template, at app/views/words/second_character.rjs, and a simple test like this shows that it's working: page.replace_html("character", "hi") But if I change it to this: page.replace_html("character", "#{@random_second.english}") I get an error saying I fed it a nil object: ActionView::TemplateError (undefined method `english_name' for nil:NilClass) on line #1 of app/views/words/second_character.rjs: 1: page.replace_html("character", "#{@random_second.english}") Of course, actually instantiating @random_second, @random_third and so on ad infinitum would be ridiculous in a real app (I would eventually figure out some better way to keep grabbing a new random record without reloading the page), but the point is that I don't know how to get any instance variable to work here. This is not even approaching my ideal solution of rendering a partial that includes the object I specify, like this: page.replace_html 'character', :partial => 'new_character', :object => @random_second As I can't get an instance variable to work directly, I obviously cannot get it to work via a partial. I have tried various things like: :object => @random_second or :locals => { :random_second => @random_second } I've tried adding these all over the place -- in the link_to_remote options most obviously -- and studying what gets passed in the parameters, but to no avail. It's at this point that I realize I don't know what I'm doing. This is my first question here. I erred on the side of providing all necessary code, rather than being brief. Any help would be greatly appreciated.

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  • Partials in Liquid

    - by kostia
    Hello, We're trying to rewrite our current views from ERb to Liquid and we got following problem: we have a lot of render(:partial => '/path/to/partial') in our code, but we found absolutely no instructions how to render partials in Liquid. The only one solution we found was with help of render_to_string but it's just to ugly to be true. Thanx!

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  • NoMethodError for time_zone_select in a form

    - by Jack
    I've set up my app exactly in line with the Railscasts Time Zone Episode 1 but when I run <%= f.time_zone_select :time_zone, ActiveSupport::TimeZone.us_zones %> I get this error NoMethodError in Users#new Showing app/views/users/new.html.erb where line #27 raised: You have a nil object when you didn't expect it! You might have expected an instance of Array. The error occurred while evaluating nil.<= With line 27 being the aforementioned line. I am really stuck on this...

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