i have a basic ruby class:
class LogEntry
end
and what i would like to do is be able to define a hash with a few values like so:
EntryType = { :error => 0, :warning => 1, :info => 2 }
so that i can access the values like this (or something similar):
LogEntry.EntryType[:error]
is this even possible in Ruby? am i going about this the right way?
You can do this:
class LogEntry
EntryType = { :error => 0, :warning => 1, :info => 2 }
end
But you want to reference it as
LogEntry::EntryType[:error]
Alternatively you could make a class method:
class LogEntry
def self.types
{ :error => 0, :warning => 1, :info => 2 }
end
end
# And a simple test
LogEntry.types[:error].should be_an_instance_of(Hash)
Why do you need a hash?
Can you not just declare the entry types on the LogEntry class?
class LogEntry
@@ErrorType = 0
End
LogEntry.ErrorType
I'm curious why you can't just make @error_type an instance variable on LogEntry instances?
class LogEntry
attr_reader :type
ERROR_RANKING = [ :error, :warning, :info, ]
include Comparable
def initialize( type )
@type = type
end
def <=>( other )
ERROR_RANKING.index( @type ) <=> ERROR_RANKING.index( other.type )
end
end
entry1 = LogEntry.new( :error )
entry2 = LogEntry.new( :warning )
puts entry1.type.inspect
#=> :error
puts entry2.type.inspect
#=> :warning
puts( ( entry1 > entry2 ).inspect )
#=> false
puts( ( entry1 < entry2 ).inspect )
#=> true
But see also Ruby's built in logging library, Logger.
