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  • does a ruby on rails rack class get access to the entire rails environment?

    - by Andrew Arrow
    that is when the def call(env) method is invoked by hitting any url, can I inside that method make some ActiveRecord queries, use classes defined in lib, etc. etc. Or is it more like an irb console without the rails env loaded? Another way to put it with a rake task example: task :foo => :environment do # with env end task :foo2 do # without env end I would think rack classes would NOT get the environment so they are super fast and don't take all the overhead of a normal rails request. But that doesn't seem to be the case. I CAN make ActiveRecord queries inside my rack class. So what is the advantage of rack then?

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  • How is it possible the class inheritance in namespaces using Ruby on Rails 3?

    - by user502052
    In my RoR3 application I have a namespace called NS1 so that I have this filesystem structure: ROOT_RAILS/controllers/ ROOT_RAILS/controllers/application_controller.rb ROOT_RAILS/controllers/ns/ ROOT_RAILS/controllers/ns/ns_controller.rb ROOT_RAILS/controllers/ns/names_controller.rb ROOT_RAILS/controllers/ns/surnames_controller.rb I wuold like that 'ns_controller.rb' inherits from application controller, so in 'ns_controller.rb' file I have: class Ns::NsController < ApplicationController ... end Is this the right approach? Anyway if I have this situation... in 'application_controller.rb' class ApplicationController < ActionController::Base @profile = Profile.find(1) end in 'ns_controller.rb' class Ns::NsController < ApplicationController @name = @profile.name @surname = @profile.surname end ... '@name' and '@surname' variables are not set. Why?

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  • Multiple calculations on the same set of data: ruby or database?

    - by Pierre
    Hi, I have a model Transaction for which I need to display the results of many calculations on many fields for a subset of transactions. I've seen 2 ways to do it, but am not sure which is the best. I'm after the one that will have the least impact in terms of performance when data set grows and number of concurrent users increases. data[:total_before] = Transaction.where(xxx).sum(:amount_before) data[:total_after] = Transaction.where(xxx).sum(:amount_after) ... or transactions = Transaction.where(xxx) data[:total_before]= transactions.inject(0) {|s, e| s + e.amount_before } data[:total_after]= transactions.inject(0) {|s, e| s + e.amount_after } ... Which one should I choose? (or is there a 3rd, better way?) Thanks, P.

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  • Ruby on Rails: How to create associated models on the fly ?

    - by Misha Moroshko
    I have the following models: class Product < ActiveRecord::Base belongs_to :brand belongs_to :model accepts_nested_attributes_for :brand, :model ... end class Brand < ActiveRecord::Base has_many :products has_many :models ... end class Model < ActiveRecord::Base has_many :products belongs_to :brand accepts_nested_attributes_for :brand ... end I have a problem to create a new product. Here is the relevant code in the controller: class ProductsController < ApplicationController ... def create @product = Product.new(params[:product]) if @product.save ... # Here is the error end ... end When user adds a new brand and a new model, params[:product] contains the following: "brand_attributes"=>{"name"=>"my_new_brand"} "model_attributes"=>{"model_no"=>"my_new_model"} and I got the following error: Mysql2::Error: Column 'brand_id' cannot be null: INSERT INTO `models` ... because model has a foreign key brand_id which is not set. I can't set it because the brand (like the model) is created on the fly when the product is created. I don't want to create the brand before the product, because then I the product has errors, I will need to delete the created brand. Then I tried to change params[:product] like this: "brand_attributes"=>{"name"=>"my_new_brand", "model_attributes"=>{"model_no"=>"my_new_model"}} but I end up with this: unknown attribute: model_attributes What would be the proper way to handle this ?

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  • How can I change the link format in will_paginate for page_cache in Ruby on Rails?

    - by jaehyun
    I want to use page_cache with will_paginate. There are good information on this page below. http://railsenvy.com/2007/2/28/rails-caching-tutorial#pagination http://railslab.newrelic.com/2009/02/05/episode-5-advanced-page-caching I wrote routes.rb looks like: map.connect '/products/page/:page', :controller => 'products', :action => 'index' But, links of url are not changed to '/products/page/:page' which are in will_paginate helper. They are still 'products?page=2' How can i change url format is in will_paginate?

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  • Ruby on Rails- :symbols, @iVars and "strings" - oh my!

    - by Meltemi
    New to Rails and trying to get my head around when/why to use :symbols, @ivars , "strings" within the framework. I think I understand the differences between them conceptually only one :symbol instance per project one @ivar per instance multiple "strings" - as they are created whenever referenced (?) Feel free to correct me! The main confusion comes from understanding the rules & conventions of what Rails expects - where and WHY? I'm sure there's an "Ah ha!" moment coming but I haven't had it yet...as it seems pretty arbitrary to me (coming from C/Obj-C). -thx

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  • How to create a project template for Ruby on Rails projects?

    - by wgpubs
    When I build Rails applications I find myself doing the same things over and over again. This includes adding the same gems/plugins, configuration info and custom initializers, rake tasks etc... etc.... This can't be a good thing. So, is there a way to package all this repetitive code into some sort of project template ... so that I can do a "rails myapp" and have everything good to go from there? Btw, running 2.3.5 if that matters :) thanks

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  • how can I display controller's variable (which is on a loop) on .html.erb page? ruby on rails

    - by rrz
    I have the following code listed below in my controller: struc = {'en' => 'english', 'es' => 'espaniol', 'de' => 'germany', 'fr' => 'french', 'it' => 'italy'} struc.each_pair do |key, value| @key=key @value=value end on my application.html.erb I have the following <select name="Language" onchange="location=this.options[this.selectedIndex].value;"> <option value="/<% @key %>/<%= @rem %>"><%= @value %></option> </select> Now how can i make the value of '@key' and '@value' appear recursively display on (application.html.erb)? Thanks in advance

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  • remote_form_for in index.html.erb file not working w/ AJAX...Ruby on Rails...

    - by bgadoci
    Just curious if I am overlooking something simple here. I have deployed the remote_form_for in the show.html.erb code before to render comments on a post (project in this case) without a problem. I have moved this code to the index view and seems to degrade to the normal form_for action (page refresh). I am not getting any javascript errors so not sure what is wrong here. Here is my code: index.html.erb <% remote_form_for [project, Comment.new] do |f| %> <p> <%= f.label :body, "New Comment" %><br/> <%= f.text_area (:body, :class => "textarea") %> </p> <p> <%= f.label :name, "Name" %> (Required)<br/> <%= f.text_field (:name, :class => "textfield") %> </p> <p> <%= f.label :email, "Email" %> (Required but will not be displayed)<br/> <%= f.text_field (:email, :class => "textfield") %> </p> <p><%= f.submit "Add Comment" %></p> <% end %> CommentsController#create def create @project = Project.find(params[:project_id]) @comment = @project.comments.create!(params[:comment]) respond_to do |format| format.html { redirect_to projects_path } format.js end end /views/comments/create.js.rjs page.insert_html :bottom, :commentwrapper, :partial => @comment page[@comment].visual_effect :highlight page[:new_comment].reset page.replace_html :notice, flash[:notice] flash.discard /views/comments/_comment.html.erb <% div_for comment do %> <div id="commentwrapper"> <% if admin? %> <%=link_to_remote "X", :url => [@project, comment], :method => :delete %> <% end %> <%= h(comment.body) %><br/><br/> Posted <%= time_ago_in_words(comment.created_at) %> ago by <%= h(comment.name) %> <% if admin? %> | <%= h(comment.email) %> <% end %></div> <% end %>

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  • Rendering field data as a link in Ruby on Rails...

    - by bgadoci
    Ok, I think this is probably an easy question but for the life of my I can't figure it out. I have created a table called ugtags and in that table I have two columns (beyond the basics), 'name' and 'link'. I am trying to allow a user to add a link to a page. Ideally they would enter the link title (name) and the url (link) and in the view it would display the title as a link to the url that was entered in the link column. I there a way to do it by simply affecting the <%= link_to h(ugtag.name) %> code?

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  • how do i get name of the month in ruby on Rails?

    - by necker
    so i create in my view: <%=date=Date.today%> How do i get the name of the month out of the date? I was trying to do sth like <%= DATE::ABBR_MONTHNAMES(date.month)%> But without success. I keep getting an error: uninitialized constant ActionView::Base::CompiledTemplates::MONTHNAMES How do i initialise the constant or is there any other way to get the name out of the Date format? would greatly appreciate any answers!

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  • Ruby on Rails: Is there a way to tell what fields failed validation in ActiveRecord?

    - by randombits
    I'm attempting to create an XML builder file that tells a user to know exactly what fields failed validation in the output. I also want to display their input back to them, so that requires me figuring out which fields failed validation. Meaning if someone fails on creating a new user resource, I want to display XML that's meaningful (Besides a meaningful HTTP status number) such as: <errors> <user> <email>bad@email: Invalid email format</email> </user> <errors> The above is tough to do in an XML builder file without knowing what field failed. And if I just iterate over error messages, I won't know how to prob my @user object to get the value that the user supplied.

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  • Ruby on Rails How do I access variables of a model inside itself like in this example?

    - by banditKing
    I have a Model like so: # == Schema Information # # Table name: s3_files # # id :integer not null, primary key # owner :string(255) # notes :text # created_at :datetime not null # updated_at :datetime not null # last_accessed_by_user :string(255) # last_accessed_time_stamp :datetime # upload_file_name :string(255) # upload_content_type :string(255) # upload_file_size :integer # upload_updated_at :datetime # class S3File < ActiveRecord::Base #PaperClip methods attr_accessible :upload attr_accessor :owner Paperclip.interpolates :prefix do |attachment, style| I WOULD LIKE TO ACCESS VARIABLE= owner HERE- HOW TO DO THAT? end has_attached_file( :upload, :path => ":prefix/:basename.:extension", :storage => :s3, :s3_credentials => {:access_key_id => "ZXXX", :secret_access_key => "XXX"}, :bucket => "XXX" ) #Used to connect to users through the join table has_many :user_resource_relationships has_many :users, :through => :user_resource_relationships end Im setting this variable in the controller like so: # POST /s3_files # POST /s3_files.json def create @s3_file = S3File.new(params[:s3_file]) @s3_file.owner = current_user.email respond_to do |format| if @s3_file.save format.html { redirect_to @s3_file, notice: 'S3 file was successfully created.' } format.json { render json: @s3_file, status: :created, location: @s3_file } else format.html { render action: "new" } format.json { render json: @s3_file.errors, status: :unprocessable_entity } end end end Thanks, any help would be appreciated.

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  • How do you pass self to class_eval in ruby?

    - by klochner
    I'm working on a metaprogramming task, where I'm trying to use a single method to define a polymorphic association in the calling class, while also defining the association in the target class. I need to pass in the name of the calling class to get the association right. Here's a snippet that should get the idea across: class SomeClass < ActiveRecord::Base has_many :join_models, :dependent=:destroy end class JoinModel < ActiveRecord::Base belongs_to :some_class belongs_to :entity, :polymorphic=true end module Foo module ClassMethods def acts_as_entity has_many :join_models, :as=:entity, :dependent=:destroy has_many :some_classes, :through=:join_models klass = self.name.tableize SomeClass.class_eval "has_many :#{klass}, :through=:join_models" end end end I'd like to eliminate the klass= line, but don't know how else to pass a reference to self from the calling class into class_eval. any suggestions?

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  • Ruby (with Rails) convert a string of time into seconds?

    - by Ryan
    So, I've got a string of time... something along the lines of '4 hours' '48 hours' '3 days' '15 minutes' I would like to convert those all into seconds. For '4 hours', this works fine Time.parse('4 hours').to_i - Time.prase('0 hours').to_i => 14400 # 4 hours in seconds, yay However, this doesn't work for 48 hours (outside of range error). It also does not work for 3 days (no information error), etc. Is there a simple way to convert these strings into seconds?

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  • Ruby on Rails: temporarily update an attribute into cache without saving it?

    - by randombits
    I have a bit of code that depicts this hypothetical setup below. A class Foo which contains many Bars. Bar belongs to one and only one Foo. At some point, Foo can do a finite loop that lapses 2+ iterations. In that loop, something like the following happens: bar = Bar.find_where_in_use_is_zero bar.in_use = 1 Basically what find_where_in_use_is_zero does something like this in as far as SQL goes: SELECT * from bars WHERE in_use = 0 Now the problem I'm facing is that I cannot run the following line of code after bar.in_use =1 is invoked: bar.save The reason is clear, I'm still looping and the new Foo hasn't been created, so we don't have a foo_id to put into bars.foo_id. Even if I set to allow foo_id to be NULL, we have a problem where one of the bars can fail validation and the existing one was saved to the database. In my application, that doesn't work. The entire request is atomic, either all succeeds or fails together. What happens next, is that in my loop, I have the potential to select the same exact bar that I did on a previous iteration of the loop since the in_use flag will not be set to 1 until @foo.save is called. Is there anyway to work around this condition and temporarily set the in_use attribute to 1 for subsequent iterations of the loop so that I retrieve an available bar instance?

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  • How can I configure Devise for Ruby on Rails to store the emails and passwords somewhere other than in the user model?

    - by TLK
    I'd like to store emails in a separate table and allow users to save multiple emails and log in with any of them. I'd also like to store passwords in a different table. How can I configure Devise to store authentication info elsewhere? Worst case scenario, if I just have to hack into it, is there a generator to just port everything over to the app? I noticed there was a generator for the views. Thanks.

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  • Pros & Cons of separating the controllers using subfolders on an ruby on rails app based?

    - by user293179
    Hi, Need some help gathering thoughts on this issue. Our team is moving ahead with the idea that separating the authenticated and public sections of our app in two separate folders will allow us to be more organized and secured. I have seen this approach for Admin apps within the site but never for authentication. We are currently using Authlogic. What would be the disadvantage of this? Thanks for your help.

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  • How to sort a hash by value in descending order and output a hash in ruby?

    - by tipsywacky
    output.sort_by {|k, v| v}.reverse and for keys h = {"a"=>1, "c"=>3, "b"=>2, "d"=>4} => {"a"=>1, "c"=>3, "b"=>2, "d"=>4} Hash[h.sort] Right now I have these two. But I'm trying to sort hash in descending order by value so that it will return => {"d"=>4, "c"=>3, "b"=>2, "a"=>1 } Thanks in advance. Edit: let me post the whole code. def count_words(str) # YOUR CODE HERE output = Hash.new(0) sentence = str.gsub(/,/, "").gsub(/'/,"").gsub(/-/, "").downcase words = sentence.split() words.each do |item| output[item] += 1 end puts Hash[output.sort_by{ |_, v| -v }] return Hash[output.sort_by{|k, v| v}.reverse] end

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