srinivas-singanamalla srinivas-singanamalla

## nil empty
nil.nil?
=> true

false.nil?
=> false

1.nil?
=> false

0.nil?

## activerecords_to_arrayofids
#one way
Model.all.map(&:field_name)

#second way
@bars = Bar.all(:select => bar.id)
@bars = @bars.map{|bar| bar.id}

#third way use pluck
Model.all.pluck(:field_name)

## array_to_hash

#events is a model with key as one of the columns
Hash[events.map { |u| [u.key, u] }]

## google apisruby
 puts "Title \t ID \t Preferred"
  client.discovered_apis.each do |gapi|
    puts "#{gapi.title} \t #{gapi.id} \t #{gapi.preferred}"
  end
	#one way
	Model.all.map(&:field_name)

	#second way
	@bars = Bar.all(:select => bar.id)
	@bars = @bars.map{\|bar\| bar.id}

	#third way use pluck
	Model.all.pluck(:field_name)

	#events is a model with key as one of the columns
	Hash[events.map { \|u\| [u.key, u] }]
	puts "Title \t ID \t Preferred"
	client.discovered_apis.each do \|gapi\|
	puts "#{gapi.title} \t #{gapi.id} \t #{gapi.preferred}"
	end