Ruby, Internet, and Programming

Today I learned that when doing database-migration on Rails, change_table :#{table_name}, bulk: true let us combine multiple alter-table statements and it could reduce the cost of the whole alteration. That is, instead of executing multiple alter-table separately, def change add_column :users, :first_name, :string, null: false add_column :users, :last_name, :string, null: false end we can run a single alter-table statement by change_table like as follows. def change change_table :users, bulk: true do |t| t.

Today I learned that Rails 6.1.3 does not have methods that raise exceptions when more than one record was found. However, in future versions, we could use ActiveRecord::FinderMethods#sole for that purpose. It seems Enumerable#sole is also going to be introduced. Sometimes I need to make sure there is one and only one record that matches a condition without using a unique-index, for example, when I cannot add that constraint to the database.

Today I learned/remembered that to format a number with a delimiter, we can use ActiveSupport::NumericWithFormat#to_s(:delimited). require 'active_support' require 'active_support/core_ext' 123456789.to_s(:delimited) # => "123,456,789" Not only that, but this method also provides other formats and takes options to tweak its behavior. 123456789.to_s(:delimited, delimiter: '-') # => "123-456-789" 123456789.to_s(:currency, precision: 3) # => "$123,456,789.000" 123456789.to_s(:human_size) # => "118 MB" 123456789.to_s(:human) # => "123 Million" Originally, when I need to format a number to a delimited number, I would try to use number_to_delimited provided by ActiveSupport::NumberHelper.

I'm developing a small application which is built on Ruby on Rails, React and Relay. Since the project is based on my personal hobby and just a prototype, I preferred to write application codes rather than to write tests at first. However, as the application grows larger, I had to test the application manually every time when I make changes to make sure it doesn't break other features. The lack of tests made development speed slower.