def prof(t = 1)
  starting_time = Time.now
  t.times { yield }
  dlta = (Time.now - starting_time).to_f
  puts "time: #{dlta.to_s}(s) . req/s: #{(1/dlta)}"
end


• Use prof to measure how long a function or any block of code takes.
• Use parameter t>1 to run the block code t times and return the average time per test

Examples:

>> prof { Flight.find_first }

In this episode we will see the files generated by the plugin generator and their purpose.


class ActiveRecord::Base
def self.count1(conditions, unique_id = nil)
connection.execute("select count(1) from #{table_name} where #{sanitize_sql(conditions)} #{'and id<>'+unique_id.to_s if unique_id}").fetch_row.first.to_i
end
end

• count(1) is the fastest way, as far as I know, for mysql to count table elements.
  Why should we use the relatively expensive count(*) when we can use this modest counter?

Rails core team recommends developing web applications that are small and very cohesive. This is documented in Domain Driven Design by Eric Evans. This allows the domain model to evolve independent of each other.

In Rails, when you need to interact between web apps you can use ActiveResource.