Senior Software Engineer @moneyforward.
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ALT # Make a number always show 2 decimals (useful for money) "%.2f" % 10 # => "10.00" "%.2f" % 10.50 # => "10.50" # You can even add the currency sign "$%.2f" % 10.50 # => "$10.50" # Convert to hexadecimal "%#x" % 1234 # => "0x4d2" # And it can do a lot more! # % is a shortcut that uses Kernel#sprintf behind the scenes # so if you're looking for the format specification, check # out the official ruby doc for Kern...
ALT rails tmp:clear rails log:clear # shortcut for both at the same time rails tmp:clear log:clear # keep in mind that this is irreversible so do this # only if you don't mind losing your logs or tmp files
ALT <% body = capture do %> <div> The body of the modal goes here! <%= link_to "Confirm", "#" %> </div> <% end %> <%= render "shared/modal", body: body %> # shared/_modal.html.erb <div> <div>Header</div> <div><%= body %></div> <div>Fooder</div> </div
![array = [nil, "", 2]
# To convert all values to strings
# instead of
array.map { |value| value.to_s }
# you can do
array.map(&:to_s)
# => ["", "", 2]
# Or to remove any nil or empty values
array.find_all(&:present?)
# => [2]
# The trick is that the ampersand(&)
# operator will convert to a proc
# and give it as a block. Converting
# a symbol to a proc will call the
# method on the param.
:to_s.to_proc.call(1)
# ...](https://pbs.twimg.com/media/FPWMOO7VUAISNyC.jpg?name=orig)
ALT array = [nil, "", 2] # To convert all values to strings # instead of array.map { |value| value.to_s } # you can do array.map(&:to_s) # => ["", "", 2] # Or to remove any nil or empty values array.find_all(&:present?) # => [2] # The trick is that the ampersand(&) # operator will convert to a proc # and give it as a block. Converting # a symbol to a proc will call the # method on the param. :to_s.to_proc.call(1) # ...
ALT class DashboardsController < ApplicationController def show request.variant = Current.user.admin? ? :admin : :user end end # View path if admin: # app/views/dashboards/show.html+admin.erb # View path if normal user: # app/views/dashboards/show.html+user.erb
![# db/migrate/20220226153929_create_orders.rb
class CreateOrders < ActiveRecord::Migration[7.0]
def change
create_table :orders do |t|
t.integer :subtotal_cents
t.integer :tax_cents
t.virtual :total_cents, type: :integer, as: "subtotal_cents + tax_cents", stored: true
t.timestamps
end
end
end
# console
Order.create(subtotal_cents: 1000, tax_cents: 200)
Order.last.total_ce...](https://pbs.twimg.com/media/FNGAInSVgAMi-za.jpg?name=orig)
ALT # db/migrate/20220226153929_create_orders.rb class CreateOrders < ActiveRecord::Migration[7.0] def change create_table :orders do |t| t.integer :subtotal_cents t.integer :tax_cents t.virtual :total_cents, type: :integer, as: "subtotal_cents + tax_cents", stored: true t.timestamps end end end # console Order.create(subtotal_cents: 1000, tax_cents: 200) Order.last.total_ce...
ALT # config/application.rb config.active_record.async_query_executor = :global_thread_pool # :multi_thread_pool executor can be used if you have multiple databases # app/controllers/dashboards_controller.rb class DashboardsController < ApplicationController def show # These queries will all run asynchronously # instead of running one by one @posts = Post.limit(500).load_async @users = User.limit(50...
![class CreateEvents < ActiveRecord::Migration[6.1]
def change
create_table :events do |t|
t.string :name
t.interval :duration
t.timestamps
end
end
end](https://pbs.twimg.com/media/FK16ZFRVQAIQhKE.jpg?name=orig)
ALT class CreateEvents < ActiveRecord::Migration[6.1] def change create_table :events do |t| t.string :name t.interval :duration t.timestamps end end end
ALT # Find all posts created in the last week Post.where(created_at: 1.week.ago..) # Find all posts having less than 10 likes Post.where(likes: ..10)