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• Modeling Buyers & Sellers in a Rails Ecommerce App

  - by MikeH

  I'm building a Rails app that has Etsy.com style functionality. In other words, it's like a mall. There are many buyers and many sellers. I'm torn about how to model the sellers. Key facts: There won't be many sellers. Perhaps less than 20 sellers in total. There will be many buyers. Hopefully many thousands :) I already have a standard user model in place with account creation and roles. I've created a 'role' of 'seller', which the admin will manually apply to the proper users. Since we'll have very few sellers, this is not an issue. I'm considering two approaches: (1) Create a 'store' model, which will contain all the relevant store information. Products would :belong_to :store, rather than belonging to the seller. The relationship between the user and store models would be: user :has_one store. My main problem with this is that I've always found has_one associations to be a little funky, and I usually try to avoid them. The app is fairly complex, and I'm worried about running into a cascade of problems connected to the has_one association as I get further along into development. (2) Simply include the relevant 'store' information as part of the user model. But in this case, the store-related db columns would only apply to a very small percentage of users since very few users will also be sellers. I'm not sure if this is a valid concern or not. It's very possible that I'm thinking about this incorrectly. I appreciate any thoughts. Thanks.

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• Rails 3 - routing

  - by akam

  I don't know how to make a link_to because I'dont have a nouveau_message_path in rake routes rake routes : GET /nouveau_message/.:id {:action=>"nouveau_message", :controller=>"messages"} routes.rb : controller :messages do get 'nouveau_message/.:id' => :nouveau_message end What is the best way to make a link_to to nouveau_message from another view ? Thanks

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• How good is the Rails sanitize() method?

  - by Horace Loeb

  Can I use ActionView::Helpers::SanitizeHelper#sanitize on user-entered text that I plan on showing to other users? E.g., will it properly handle all cases described on this site? Also, the documentation mentions: Please note that sanitizing user-provided text does not guarantee that the resulting markup is valid (conforming to a document type) or even well-formed. The output may still contain e.g. unescaped ’<’, ’’, ’&’ characters and confuse browsers. What's the best way to handle this? Pass the sanitized text through Hpricot before displaying?

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• Creating object in database without showing view to user

  - by samuil

  I have controller with action new, and I want it to create ActiveRecord::Base descendant object, and write it into database (without showing it to user). def new active_order = current_user.orders.find {|o| o.status > 0 } active_order = Order.new if active_order.nil? (...) end Order.new creates local object, but my question is -- how to make Rails to fill it with default values and write to database?

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• Rails 3 MySQL 2 reports an error in what looks to be valid SQL syntax

  - by John Judd

  I am trying to use the following bit of code to help in seeding my database. I need to add data continually over development and do not want to have to completely reseed data every time I add something new to the seeds.rb file. So I added the following function to insert the data if it doesn't already exist. def AddSetting(group, name, value, desc) Admin::Setting.create({group: group, name: name, value: value, description: desc}) unless Admin::Setting.find_by_sql("SELECT * FROM admin_settings WHERE group = '#{group}' AND name = '#{name}';").exists? end AddSetting('google', 'analytics_id', '', 'The ID of your Google Analytics account.') AddSetting('general', 'page_title', '', '') AddSetting('general', 'tag_line', '', '') This function is included in the db/seeds.rb file. Is this the right way to do this? However I am getting the following error when I try to run it through rake. rake aborted! Mysql2::Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'group = 'google' AND name = 'analytics_id'' at line 1: SELECT * FROM admin_settings WHERE group = 'google' AND name = 'analytics_id'; Tasks: TOP => db:seed (See full trace by running task with --trace) Process finished with exit code 1 What is confusing me is that I am generating correct SQL as far as I can tell. In fact my code generates the SQL and I pass that to the find_by_sql function for the model, Rails itself can't be changing the SQL, or is it? SELECT * FROM admin_settings WHERE group = 'google' AND name = 'analytics_id'; I've written a lot of SQL over the years and I've looked through similar questions here. Maybe I've missed something, but I cannot see it.

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• Rails: Pass association object to the View

  - by Fedyashev Nikita

  Model Item belongs_to User. In my controller I have code like this: @items = Item.find(:all) I need to have a corresponding User models for each item in my View templates. it works in controller(but not in View template): @items.each { |item| item.user } But manual looping just to build associations for View template kinda smells. How can I do this not in a creepy way?

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• Rails 2.3.5: flash[:notice] disappears after redirect_to call

  - by xyzman

  Here I've got two controller methods: def invite if request.post? begin email = AccountMailer.create_invite(@user,url) AccountMailer.deliver(email) flash[:notice] = "Invitation email sent to #{@user.email}" rescue #mail delivery failed flash[:error] = "Failed to deliver invitation" end redirect_to :action => :show, :id => @user.id end end and def show @title = "User #{@user.full_name}" end The problem is, when I send an invitation, and get redirected to ./show, I see no messages at all. If I change redirect_to to render, the message appears. Still, isn't it intended for flash to work in the immediate subsequent requests? BTW, I'm using Rails+Passenger setup, could it be so that redirected request goes to another application instance?

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• Missing Required Gems - javan-whenever and cron job in rails

  - by Matenia Rossides

  Hi, I have finally managed to get javan-whenever gem working on my site5 server, and updating the crontab is quite easy, however whenever a cron job is run with the code that is generated, i get a "missing required gems" error where it lists about 8/10 of my gems. Has anyone else had this problem? If so, what would the solution be. The funny thing is that when it outputs where my gems are, this is all correct, and the gems are loading fine from within my application. Cheers, Matenia

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• SMS using Rails in India

  - by Salil

  Is it possible to send SMS in india using rails applcations? If so, can you provide an example? I checked for the clickatell but I think it works only in Australia or the UK.

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• Rails - Create if record doesn't exist or else update.....Whats Best way to do this?

  - by ChrisWesAllen

  Hi, I have a create statement for some models but its creating a record within a join table regardless if the record exist. Here is what my code looks like. @user = User.find(current_user) @event = Event.find(params[:id]) for interest in @event.interests @user.choices.create(:interest => interest, :score => 4) end The problem is it creates records no matter what. I would like it to create a record if it doesnt exist, if a record does exist I would just to it to take the attribute of the found record and add or subtract 1. So, I've been looking around and I see something called find_or_create_by. My question is what happens if it finds? Preferably if it finds,I would like to take the current :score attribute and +1. SO is it possible to find or create by id? I'm not sure what attribute I would find by since the model I'm looking at is a join model which only had id foreign keys and the score attribute. I tried @user.choices.find_or_create_by_user(:user => @user.id, :interest => interest, :score => 4) but got "undefined method `find_by_user'".....ANy ideas or help?

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• Rails Collection_select names

  - by Jack

  Hi, I am creating a Rails app and have added a form: <div class="field"> <%= f.label :title %><br /> <%= f.text_field :title %> </div> <div class="field"> <%= f.label :client_id %><br /> <%= collection_select(:project, :client_id, Client.all, :id, :contact_name, {:prompt => "Select a Client"}) %> </div> This currently displays the contact_name of the client. Is it possible to have it display a list of contact_names concatenated with the client_id? If so, how would I do this? Cheers

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• sip.conf configuration file - add new line to each record

  - by Flukey

  I have a sip configuration file which looks like this: [1664] username=1664 mailbox=1664@8360 host=192.168.254.3 type=friend subscribemwi=no [1679] username=1679 mailbox=1679@8360 host=192.168.254.3 type=friend subscribemwi=no [1700] username=1700 mailbox=1700@8360 host=192.168.254.3 type=friend subscribemwi=no [1701] username=1701 mailbox=1701@8360 host=192.168.254.3 type=friend subscribemwi=no For each record I need to add another line (vmxten for each record) for example the above becomes: [1664] username=1664 mailbox=1664@8360 host=192.168.254.3 type=friend subscribemwi=no vmexten=1664 [1679] username=1679 mailbox=1679@8360 host=192.168.254.3 type=friend subscribemwi=no vmexten=1679 [1700] username=1700 mailbox=1700@8360 host=192.168.254.3 type=friend subscribemwi=no vmexten=1700 [1701] username=1701 mailbox=1701@8360 host=192.168.254.3 type=friend subscribemwi=no vmexten=1701 What would you say would be the quickest way to do this? there are hundreds of records in the file, therefore modifying all of the records by hand would take a long time. Would you use Regex? Would you use sed? I'm interested to know how you would approach the problem. Thanks

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• A better way to find a module's children?

  - by c00lryguy

  This is what I've got, but it also finds classes and other constants.. is there a better way? class Module def children constants.collect { |c| const_get(c) }.compact end end

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• rails: best way to store comments in mysql

  - by ciss

  Hello. Okay i have two models: posts and comments. as you can think comments has column :post_id. My models Comments belongs_to :post Post has_many :comments So, this is pretty simple association but i have some problems with ordering comments. at first time, when i create my comments migration file i just add column :position. This column indicate comment position in the post. But now i think what where is more good way to do this. so i can't make my choise: 1) uses t.column :datatime :created_at, :default = Time.now() 2) or use timestamps? this is undiscovered for me, please tell me about your exp.

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• I built my rails app with sqlite and without specifying any db field sizes, Is my app now foobared for production?

  - by Tim Santeford

  I've been following a lot of good tutorials on building rails apps but I seem to be missing the whole specifying and validating db field sizes part. I love not needing to have to think about it when roughing out an app (I would have never done this with a PHP or ASP.net app). However, now that I'm ready to go to production, I think I might have done myself a disservice by not specifying field sizes as I went. My production db will be MySQL. What is the best practice here? Do I need to go through all of my migration files and specify sizes, update all the models with validation, and update all my form partial views with input max widths? or am I missing a critical step in my development process?

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• scope equivalent in rails 2.3.x?

  - by Jacob Relkin

  Is there a way to generate a group of routes under an admin scope without having to create a new physical directory (like namespace requires you to). I know that in Rails 3 there is a scope method on the route mapper, and this appears to do what I want, but apparently it doesn't exist in Rails 2.3.x My goal is to have a route like this: "/admin/products" map to "app/controllers/products_controller, not "app/controllers/admin/products_controller". Is there any way to accomplish this in Rails 2.3.x?

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• Override as_json or to_json model class name

  - by Jack

  I'd like to modify the classname when calling to_json on an AR model. i.e. Book.first.to_json #=> "{\"book\":{\"created_at\":\"2010-03-23 Book.first.to_json(:root => 'libro') #=> "{\"libro\":{\"created_at\":\"2010-03-23 Is there an option to do this?

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• How do I add text to an empty element in Hpricot?

  - by Hates_

  If I have an empty tag: <tag/> How can I add text so that I end up with: <tag>Hello World!</tag> I can only seem to swap the whole tag with different content or add content before/after it.

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• usage of attr_attribute in Rails

  - by Ethan

  When do you use attr_reader/writer/attribute in Rails models?

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• Creating objects and referencing before saving object to db

  - by Flexo

  Sorry about the vague title, but i didnt know how to ask the question in one line :) I have an order with nested itemgroups that again have nested items. the user specify the amount of item that he would like to have in each itemgroup. I would like to create these items in the create method of the orders controller when the order itself is being created. I kinda have 2 problems here. First, how do i set the reference of the items, or better yet, put the items into the @order object so they are saved when the @order is saved? the items are being stored in the db as the code is now, but the reference is not set because the order is not stored in the db yet so it doesnt have an id yet. Second, im not sure im using the correct way to get the id from my itemgroup. @order = Order.new(params[:order]) @order.itemgroups.each do |f| f.amount.times do @item = Item.new() @item.itemgroup_id = f.id @item.save end end

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• Syntax errors on Heroku, but not on local server (postgresql related?)

  - by Phil_Ken_Sebben

  I'm trying to deploy my first app on Heroku (rails 3). It works fine on my local server, but when I pushed it to Heroku and ran it, it crashes, giving a number of syntax errors. These are related to a collection of scopes I use like the one below: scope :scored, lambda { |score = nil| score.nil? ? {} : where('products.votes_count >= ?', score) } it produces errors of this form: "syntax error, unexpected '=', expecting '|' " "syntax error, unexpected '}', expecting kEND" Why is this syntax making Heroku choke and how can I correct it? Thanks! EDIT: I was using sqlite on my local machine and Heroku does not support that. Trying to make sure the db is properly configured for PG. I believe I have done that by specifying in the gemfile that sqlite only be used in development. Yet I still get these syntax errors, that interrupt even the db:migrate. EDIT: So now it seems more likely that my scope syntax doesn't work in postgreSQL. Does anyone know how to convert this properly?

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• Advanced find in Rails

  - by jriff

  Hi all I really suck at Rails' finders besides the most obvious. I always resort to SQL when things get more advanced than Model.find(:all, :conditions => ['field>? and field<? and id in (select id from table)', 1,2]) I have this method: def self.get_first_validation_answer(id) a=find_by_sql(" select answers.*, answers_registrations.answer_text from answers_registrations left join answers on answers_registrations.answer_id=answers.id where (answers_registrations.question_id in (select id from questions where validation_question=true)) and (sale_registration_id=#{id}) limit 1 ").first a.answer_text || a.text if a end Can someone create a find method that gets me what I want? Regards, Jacob

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• How to force Rails to use gem of version X

  - by David Lazar

  I have a rails app with the config/environment.rb line config.gem 'authlogic', :version => '2.1.2' The system gem for authlogic is 2.1.4 The one in my GEM_PATH is 2.1.2 No matter what I try, Rails is only using the 2.1.4 version, which is a problem. How to force rails to use 2.1.2? Thanks

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• Form submission and hyperlinks using GET and POST

  - by Jon

  I have a search resource, the user can perform searches by filling out a form and submitting it, the create action is called, the Search is saved, the show action is called, and the results are displayed. This all happens with the default POST, and all works fine. The user may want to save his search in the saved_search table (i don't use the Search table for this purpose as this table stores all searches for the purpose of compiling statistics, and gets cleared on a regular basis). Once the Search is saved, it can be re-run by clicking a hyperlink, this is where i start to get problems. I see no way of getting my hyperlink to run the create action of Search, with a POST request, and the necessary data. I then decided to try to get both form submission and the hyperlink to perform a search using a GET request, i was unable to get form_for to run my Search create action using a GET request, it always seems to get routed to my index action. Can someone suggest a good restful solution to this problem please. Many thanks

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• Rails: Modeling an optional relation in ActiveRecord

  - by Hassinus

  I would like to map a relation between two Rails models, where one side can be optionnal. Let's me be more precise... I have two models: Profile that stores user profile information (name, age,...) and User model that stores user access to the application (email, password,...). To give you more information, User model is handled by Devise gem for signup/signin. Here is the scenario of my app: 1/ When a user register, a new row is created in User table and there is an equivalent in Profile table. This leads to the following script: class User < ActiveRecord::Base belongs_to :profile end 2/ A user can create it's profile without registering (kind of public profile with public information), so a row in Profile doesn't have necessarily a User row equivalent (here is the optional relation, the 0..1 relation in UML). Question: What is the corresponding script to put in class Profile < AR::Base to map optionally with User? Thanks in advance.

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