plusplus

vagrant@precise64:/vagrant/prereqs-rhel-v3$ sudo -u postgres createdb -O postgres -E utf8 -T template0 dbname
createdb: database creation failed: ERROR:  encoding UTF8 does not match locale en_US
DETAIL:  The chosen LC_CTYPE setting requires encoding LATIN1.
vagrant@precise64:/vagrant/prereqs-rhel-v3$ 

plusplus

# Thoughts on using active model validations for service objects...
#
# NOTE: I edited this code in the GIST - there are probably errors. I even converted
# to old hash syntax for Pat and Warren.
#
# So this is a service or command object, something straight out of a method object refactoring.
# You create it, then execute it (call `call`). I've used `ActiveModel::Validations` to define validations
# that need to be met before the command is run.
#
# It would be perfectly reasonable to define call so it calls valid first, and returns true or false

plusplus

class MultiplyTask
  def call(a,b)
    a * b
  end
end

task1 = MultiplyTask.new
task2 = ->(a,b) {a * b}

task1.(2,4)

plusplus

# number of rows in the file
results.size
# => 105293

# number of unique stock ids
results.map {|l| l[:stock_unique_id]}.uniq.size
# => 95067  

# number of stocked lines
stocked_ids   = Set.new(results.select {|l| l[:stocked] == '1'}.map {|l| l[:stock_unique_id]})