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• How to thoroughly clean up a ruby on rails project?

  - by hip10

  Hi, I am very new to ruby on rails. I've installed a complicated ruby on rails project via github clone and bundle install, and I was making minor changes to it until it reaches a point whereby it is not stable anymore, sass was throwing strange exceptions, so did other ruby gems. For a rails project, is there a way to clean up the project (aka, remove any "compiled or cached code") and just run again. My alternative now is to go thru github clone and bundle install again, but that means all of my modified changes have to be reapplied again. What is rails equivalent of "make clean" in Java? Is "rake clean" the answer? Do we need to run any bundle commands?

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• Rails: include index with fields_for form helper

  - by Patrick Oscity

  i'm trying to build two models from one form by using the fields_for method. my code looks like this: <% for scale in @event.scales %> <% f.fields_for "scale[]", scale do |scale_form| %> <p> Scale<br /> <%= scale_form.label :name %> <%= scale_form.text_field :name %> <%= scale_form.label :price %> <%= scale_form.text_field :price %> </p> <% end %> <% end %> but unfortunately the output html is missing the id's of the scales: <p> Scale<br /> <label for="event_scale__name">Name</label> <input id="event_scale__name" name="event[scale][][name]" size="30" type="text" /> <label for="event_scale__price">Price</label> <input id="event_scale__price" name="event[scale][][price]" size="30" type="text" /> </p> ... here's the corresponding controller and model: class EventsController < ApplicationController ... def new @event = Event.new @providers = Provider.find(:all, :order => :name) 3.times { @event.scales.build } respond_to do |format| format.html end end ... end class Event < ActiveRecord::Base has_many :scales ... end what am i doing wrong?

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• Read from params[] in Rails

  - by Adnan

  Hi, I use: <%= select( "payment", "id", { "Visa" => "1", "Mastercard" => "2"}) %> and I get this in HTML <select id="payment_id" name="payment[id]"><option value="2">Mastercard</option> <option value="1">Visa</option></select> now how can I read the payment[id] with params[], if I use params[payment[id]] I get an error.

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• rails rollback updates when task fails

  - by ash34

  Hi, I have the following "generate_report" method being called from a rake task, which gets a hash as an input, that contains the reported hours spent by each user on a task and outputs the data as a .csv report. desc "Task reporting" task :report, [:inp_dt] => [:environment] do |t, args| h = select_data(args.inp_dt) /* not shown here */ generate_report(h) end def generate_report(h) out_dir = File.dirname(__FILE__) + '/../../output' myfile = "#{out_dir}" + "/monthly_#{Date.today.strftime("%m%d%Y")}.csv" writer = CSV.open(myfile, 'w') h.each do |h,v| v.each do |key,val| writer << val end end writer.close end where h = {:BILL=>{:PROJA=>["CYR", "00876", "2", 24], :PROJB=>["EPR", "00876", "2", 16]}, :JANE=>{:PROJA=>["TRB", "049576", "2", 16]}} I would like to set/update a 'processed' flag for each reported transaction and only commit the update when the file is written correctly or rollback the updates when the task fails. How can I accomplish this. thanks, ash

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• Accessing the params hash for year and month rails and using in helper

  - by Matt

  So I took some php code and turned it into a calendar with a helper to make a simple calendar. I got my data from inside the helper: def calendar_maker a = Time.now b = a.month d = a.year h = Time.gm(d,b,1) #first day of month Now I want to try and do it with parameters within my method #from the helper file def calendar_maker(year, month) a = Time.now b = month c = year h = Time.gm(d,b,1) #first day of month #from my html.erb file <%= @month %> and <%= @year %> <%= params["month"] %><br /> <%= params["action"] %><br /> <%= params["year"] %><br /> <%= calendar_maker( @year, @month) %> #from controller file def calendar @month = params[:month] @year = params[:year] end Anyways mistakes were made and not finding documentation anywhere or not looking in the right place. How do I get this to work with my params hash. Thanks for the help.

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• Ruby/Rails - Add records to an object with each loop iteration / Object vs Arrays

  - by ChrisWesAllen

  I'm trying to figure out how to add records to an existing object for each iteration of a loop. I'm having a hard time discovering the difference between an object and an array. I have this @events = Event.find(1) @loops = Choices.find(:all, :limit => 5) #so loop for 5 instances of choice model for loop in @loops @events = Event.find(:all,:conditions => ["event.id = ?", loop.event_id ]) end I'm trying to add a new events to the existing @events object based on the id of whatever the loop variable is. But the ( = ) operator just creates a new instance of the @events object. I tried ( += ) and ( << ) as operators but got the error "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" I tried created an array events = [] events << Event.find(1) @loops = Choices.find(:all, :limit => 5) #so loop for 5 instances of choice model for loop in @loops events << Event.find(:all,:conditions => ["event.id = ?", loop.event_id ]) end But I dont know how to call that arrays attributes within the view With objects I was able do create a loop within the view and call all the attributes of that object as well... <table> <% for event in @events %> <tr> <td><%= link_to event.title, event %></td> <td><%= event.start_date %></td> <td><%= event.price %></td> </tr> <% end %> </table> How could i do this with an array set? So the questions are 1) Whats the difference between arrays and objects? 2) Is there a way to add into the existing object for each iteration? 3) If I use an array, is there a way to call the attributes for each array record within the view?

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• Rails: Different prices for different branches, association depending on two other models combined

  - by Greg Lemond

  I have three models: Service has_many :prices has_many :groups, through: prices Price belongs_to :service belongs_to :group Group has_many :prices I want to have an input field (Simple_Form) for every price. In views/services/_form.html.haml I do: simple_form_for @service do |f| simple_fields_for :groups do |g| simple_fields_for :prices do |p| p.input :price With this setup I only get input fields for already saved prices. How I can get a price field for every group? I tried to do it manually, but it got really nasty and didn't work either. Thanks for any ideas!

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• Does a rails production.log store indefinitely?

  - by Trip

  If it doesn't, what's the half-life of it? It it does, where can find that information? On my server I found a few logs for each of my releases. But they only date back a few days. Specifically, I am looking for emails that were sent while my mail server was down two weeks ago.

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• FBML + jquery Validation + Rails

  - by user359467

  Hi all, In my local machine i have a scaffold that uses Jquery Validation plugin for the field's validation. Now i want to add that to a fbml facebook application, but i'm haven't been able to load the jquery javascript and the jquery Validation plugin into the app, does anybody now how to do that? or maybe someone could suggest me a better way of doing validation inside a facebook application. Thanks in Advance Ernesto Carrión

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• Metaprogramming ActiveRecord Rails

  - by Dimitar Vouldjeff

  Hi, I have the following code in my project`s lib directory module Pasta module ClassMethods def self.has_coordinates self.send :include, InstanceMethods end end module InstanceMethods def coordinates [longitude ||= 43.0, latitude ||= 25.0] end end ActiveRecord::Base.extend ClassMethods end And it should create a class method for ActiveRecord::Base - has_coordinates - which I can "assign" to models... But I receive the error undefined local variable or method 'has_coordinates' Thanks in advance!

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• Ruby on Rails when create method fails, render loses local variables

  - by Jimmy

  Hey guys I have a simple create method with some validations and whenever the create method fails due to validation errors it re-renders the 'new' action. The problem is in my new action/view I have a local variable that is established in the action and passed to a partial to render some related information to what the user is creating. Now when my create action fails and I try to re-render the 'new' action I'm getting the always awesome undefined method `cover' for nil:NilClass error. What is the best way to handle re-establishing my action's local variables on a render instead of redirecting to the action again and the user losing the data they input?

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• Rails: three most recent records by unique belongs_to associated record

  - by Dennis Collective

  class User has_many :comments end class Comment belongs_to :user named_scope :recent, :order => 'comments.created_at DESC' named_scope :limit, lambda { |limit| {:limit => limit}} named_scope :by_unique_users end what would I put in the :by_unique_users so that I can do Comment.recent.by_unique_users.limit(3), and only get one comment per user on sqlite named_scope :by_unique_user, :group = "user_id" works, but makes it freak out on postgres, which is deployed on production PGError: ERROR: column "comments.id" must appear in the GROUP BY clause or be used in an aggregate function

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• Rails 3 Join Question for Votes Table

  - by Dex

  I have a table posts and a polymorphic table votes. The votes table looks like this: create_table :votes do |t| t.references :user # user_id t.vote # the vote value t.references :votable # votable_type and votable_id end I want to list all posts that the user has not yet voted on. Right now I'm basically taking all the posts they've already voted on and subtracting that from the entire set of posts. It works but it's not very convenient as I currently have it. def self.where_not_voted_on_by(user) sql = "SELECT P.* FROM posts P LEFT OUTER JOIN (" sql << where_voted_on_by(user).to_sql sql << ") ALREADY_VOTED_FOR ON P.id = ALREADY_VOTED_FOR.id WHERE (user_id is null)" puts sql resultset = connection.select_all(sql) results = [] resultset.each do |r| results << Post.new(r) end results end def self.where_voted_on_by(user) joins(:votes.outer).where("user_id = #{user.id}").select("posts.*, votes.user_id") end

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• where can I find the rake tasks delivered with rails

  - by ash34

  I am looking for tasks like tmp:clear or db:migrate. Where can I find the code for these tasks. I remember seeing them before but don't recollect where. Also, is there a way I can set some global variables in a .rake file that can be accessed by all tasks in that file without passing them as arguments to each task. thanks, ash

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• Rails will_paginate custom route

  - by kristian nissen

  How can I use will_paginate with a custom route? I have the following in my routes: map.connect 'human-readable/:name', :controller => :tags, :action => 'show' but will_paginate uses url_for as far as I can tell, but I want to use 'human-readable' instead of url_for, but how?

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• Rails populate edit form for non-column attributes

  - by Rabbott

  I have the following form: <% form_for(@account, :url => admin_accounts_path) do |f| %> <%= f.error_messages %> <%= render :partial => 'form', :locals => {:f => f} %> <h2>Account Details</h2> <% f.fields_for :customer do |customer_fields| %> <p> <%= customer_fields.label :company %><br /> <%= customer_fields.text_field :company %> </p> <p> <%= customer_fields.label :first_name %><br /> <%= customer_fields.text_field :first_name %> </p> <p> <%= customer_fields.label :last_name %><br /> <%= customer_fields.text_field :last_name %> </p> <p> <%= customer_fields.label :phone %><br /> <%= customer_fields.text_field :phone %> </p> <% end %> <p> <%= f.submit 'Create' %> </p> <% end %> As well as attr_accessor :customer And I have a before_create method for the account model which does not store the customer_fields, but instead uses them to submit data to an API.. The only thing I store are in the form partial.. The problem I'm running into is that when a validation error gets thrown, the page renders the new action (expected) but none of the non-column attributes within the Account Detail form will show? Any ideas as to how I can change this code around a bit to make this work me?? This same solution may be the help I need for the edit form, I have a getter for the data which it asks the API for, but without place a :value = "asdf" within each text box, it doesn't populate the fields either..

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• Recognize routes in rails console Session.

  - by Senthil

  Say I have a router helper that I want more info on, like blogs_path, how do I find out the map statements behind that in console. I tried generate and recognize and I got unrecognized method error, even after I did require 'config/routes.rb' THanks

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• Rails route hanging

  - by Bob

  I'm trying to get someone else's app up and running on my development laptop but I ran into a routing issue and I'm not sure how to debug it. For a particular controller/action, it just hangs and doesn't time out and there is no error message in the development log. Does anyone know how I can debug this? Thanks.

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• Rails - Preventing users from contributing to website when there score is too low - callback / obser

  - by adam

  A User can add a Sentence directly on my website, via twitter or email. To add a sentence they must have a minimum score. If they don't have the minimum score they cant post the sentence and a warning message is either flashed on the website, sent back to them via twitter or email. So I'm wondering how best to code this check. Im thinking a sentence observer. So far my thoughts are in before_create score_sufficient() - score ok = save - score too low = do not save In the case of too low i need to return some flag so that the calling code can then fire off teh relevant warning. What type of flag should I return? False is too ambiguous as that could refer to validation. I could raise an exception but that doesn't sound right or I could return a symbol? Is this even the right approach? What's the best way to code this?

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• Cache headers in Rails

  - by Dimitar Vouldjeff

  Hi, I`m trying to add cache headers on my static files (.css, .js), but only way I found is with some .htaccess stuff that make the page to throw 500 error. So my question is whether there is easier way to add those headers? Thanks in advance.

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• Is there a better acts_as_commentable for Rails?

  - by levi rosol

  Here's what I'm looking to do. I have a site where I want the user to be able to leave comments on various Models. acts_as_commentable is the obvious starting point for this, but I'm curious if there is a gem / plug-in with a more robust feature-set. For example: Pre-built partial(s) (w/ or w/o Twitter / FB buttons) Partial(s) that utilize jQuery Twitter and / or FB tunnels (push to the users twitter / FB when they comment) Pre-built mechanism for pushing other users comments to users viewing that Model I can see how some of this functionality could be app specific, however, a generic implementation seems like it would be useful. I'm curious if something like this exists or not.

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• Generating report with MySQL and Rails - how?

  - by Arywista

  Here is my data model from my application: id :integer(4) not null, primary key spam :boolean(1) not null duplicate :boolean(1) not null ignore :boolean(1) not null brand_id :integer(4) not null attitude :string not null posted_at :datetime not null Attitude could have 3 states: negative, positive, neutral. I want to generate resultset in table, this way, for each day between start and end date: date | total | positive | neutral | negative 2009-10-10 | 12 | 4 | 7 | 1 (...) 2009-10-30 | 5 | 2 | 1 | 1 And ignore all records which have: duplicate = true ignore = true spam = true How it's could be done?

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• RMagick + Rails + Heroku?

  - by Elliot

  I'm trying to figure out how to get rmagick on my app, and then make it work on Heroku?

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• Including associations optimization in Rails

  - by Vitaly

  Hey, I'm looking for help with Ruby optimization regarding loading of associations on demand. This is simplified example. I have 3 models: Post, Comment, User. References are: Post has many comments and Comment has reference to User (:author). Now when I go to the post page, I expect to see post body + all comments (and their respective authors names). This requires following 2 queries: select * from Post -- to get post data (1 row) select * from Comment inner join User -- to get comment + usernames (N rows) In the code I have: Post.find(params[:id], :include => { :comments => [:author] } But it doesn't work as expected: as I see in the back end, there're still N+1 hits (some of them are cached though). How can I optimize that?

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• Rails Load Data into Application every time a New User is Created

  - by looloobs

  Hi I am trying to figure out the "right" way to do this. In my application every time I create a new user I want to have specific data loaded into an associated table. The associated table is a different preset lists. So a User has many lists and those lists have many items. Some of those Items I want to be loaded when the User is created. I really don't know how to go about doing this but I am guessing something like: create User after_create: create Lists (need already existing data for the list names) after_create List then populate Items table with existing data for these Lists. Should I be using seed data for this? Is that alright for production and if so how exactly would I go about doing that. Any guidance or other recommendations are greatly appreciated.

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