This https://github.com/rails/strong_parameters seems like the relevant section of the docs: The permitted scalar types are String, Symbol, NilClass, Numeric, TrueClass, FalseClass, Date, Time, DateTime, StringIO, IO, ActionDispatch::Http::UploadedFile and Rack::Test::UploadedFile. To declare that the value in params must be an array of permitted scalar values map the key to an empty array: params.permit(:id => []) In … Read more
You can do this: sql = “Select * from … your sql query here” records_array = ActiveRecord::Base.connection.execute(sql) records_array would then be the result of your sql query in an array which you can iterate through.
I’ve used the extremely popular Whenever on projects that rely heavily on scheduled tasks, and it’s great. It gives you a nice DSL to define your scheduled tasks instead of having to deal with crontab format. From the README: Whenever is a Ruby gem that provides a clear syntax for writing and deploying cron jobs. … Read more
Assuming you’re looking to kill whatever is on port 3000 (which is what webrick normally uses), type this in your terminal to find out the PID of the process: $ lsof -wni tcp:3000 Then, use the number in the PID column to kill the process: $ kill -9 PID
I remember my CompSci professor saying never to use floats for currency. The reason for that is how the IEEE specification defines floats in binary format. Basically, it stores sign, fraction and exponent to represent a Float. It’s like a scientific notation for binary (something like +1.43*10^2). Because of that, it is impossible to store … Read more
Here’s how you should do it: change_column :users, :admin, :boolean, :default => false But some databases, like PostgreSQL, will not update the field for rows previously created, so make sure you update the field manaully on the migration too.
:primary_key, :string, :text, :integer, :float, :decimal, :datetime, :timestamp, :time, :date, :binary, :boolean, :references See the table definitions section.
Asked the same question to one of Rails-Core’s members: https://twitter.com/luislavena/status/108998968859566080 And the answer: https://twitter.com/tenderlove/status/108999110136303617 ya, it’s fine. Need to clean it up, but nothing is being hurt.
These answers are a bit dated. Therefore I give you: hash = JSON.parse string Rails should automagically load the json module for you, so you don’t need to add require ‘json’.
In Rails 3 and newer: Rails.root which returns a Pathname object. If you want a string you have to add .to_s. If you want another path in your Rails app, you can use join like this: Rails.root.join(‘app’, ‘assets’, ‘images’, ‘logo.png’) In Rails 2 you can use the RAILS_ROOT constant, which is a string.