Get instance methods of class only

Rails
1

A little confused: My aim is to get an array of only the methods I
create
in my class. For example, in the class below if I am successful I should
see
a list of three methods: [:subject, :affiliate, :address].

I know I can ask for class#methods, but that gives me a lot of inherited
methods (see below). I see online that if I call class#methods(false)
then I
should get my desired response, however when I try this on this class, I
get
[], empty array. Is there a way to do this? Reason why I want this is so
I
can iterate my methods on initialize and set default values, to avoid
@subect="" @affiliate=""… etc. Of course my real class is much bigger
than three methods otherwise would not worry about it.

ruby-1.9.2-p0 > class Entry
ruby-1.9.2-p0 ?> attr_accessor :subject,
ruby-1.9.2-p0 > :affiliate,
ruby-1.9.2-p0 > :address
ruby-1.9.2-p0 ?> end
=> nil
ruby-1.9.2-p0 > e = Entry.new
=> #Entry:0x2778ec0
ruby-1.9.2-p0 > e.methods(false)
=> []
ruby-1.9.2-p0 > e.methods
=> [:subject, :subject=, :affiliate, :affiliate=, :address, :address=,
:taguri=, :taguri, :to_yaml_style, :to_yaml_properties, :syck_to_yaml,
:to_yaml, :blank?, :present?, :presence, :duplicable?, :acts_like?,
:try,
:html_safe?, :`, :returning, :to_param, :to_query, :instance_values,
:instance_variable_names, :copy_instance_variables_from, :to_json,
:with_options, :as_json, :require_or_load, :require_dependency,
:require_association, :load_dependency, :load, :require, :unloadable,
:pretty_print, :pretty_print_cycle, :pretty_print_instance_variables,
:pretty_print_inspect, :to_sql, :equality_predicate_sql,
:inequality_predicate_sql, :bind, :find_correlate_in, :nil?, :===, :=~,
:!~,
:eql?, :hash, :<=>, :class, :singleton_class, :clone, :dup,
:initialize_dup,
:initialize_clone, :taint, :tainted?, :untaint, :untrust, :untrusted?,
:trust, :freeze, :frozen?, :to_s, :inspect, :methods,
:singleton_methods,
:protected_methods, :private_methods, :public_methods,
:instance_variables,
:instance_variable_get, :instance_variable_set,
:instance_variable_defined?,
:instance_of?, :kind_of?, :is_a?, :tap, :send, :public_send,
:respond_to?,
:respond_to_missing?, :extend, :display, :method, :public_method,
:define_singleton_method, :id, :object_id, :to_enum, :enum_for,
:gem,
:silence_warnings, :enable_warnings, :with_warnings, :silence_stderr,
:silence_stream, :suppress, :class_eval, :pretty_inspect,
:require_library_or_gem, :debugger, :breakpoint, :==, :equal?, :!, :!=,
:instance_eval, :instance_exec, :send]
ruby-1.9.2-p0 >

2

On Nov 11, 2010, at 4:22 PM, David K. wrote:

A little confused: My aim is to get an array of only the methods I
create in my class. For example, in the class below if I am
successful I should see a list of three methods:
[:subject, :affiliate, :address].

Well, I think you mean six methods as you’ll have the setters also.

ruby-1.9.2-p0 > e.methods
, :taguri
?, :acts_like
, :with_options
, :pretty_print_instance_variables

, :untrusted
, :instance_variables
?, :respond_to_missing
, :silence_warnings
ruby-1.9.2-p0 >
In your subject line, you almost had it right, try:
Entry.instance_methods(false)

Here’s a quick implementation of something like you described.

class Entry
attr_accessor :subject, :affiliate, :address
def initialize(options={})
self.class.instance_methods(false).grep(/=/).each do |name|
var = name.to_s.sub(/=$/,‘’).to_sym
if options.has_key?(var)
puts “#{name} #{options[var]}”
self.send(name, options[var])
else
puts “no value given for #{var}”
end
end
end
end
irb> Entry.instance_methods(false)
=> [:subject, :subject=, :affiliate, :affiliate=, :address, :address=]
irb> e = Entry.new(:address => ‘123 Main St.’)
no value given for subject
no value given for affiliate
address= 123 Main St.
=> #<Entry:0x1e73f0 @address=“123 Main St.”>

-Rob

Rob B. http://agileconsultingllc.com
[email protected]
+1 513-295-4739
Skype: rob.biedenharn

3

On Thu, Nov 11, 2010 at 4:12 PM, Rob B.
[email protected]wrote:

On Nov 11, 2010, at 4:22 PM, David K. wrote:

A little confused: My aim is to get an array of only the methods I create
in my class. For example, in the class below if I am successful I should see
a list of three methods: [:subject, :affiliate, :address].

Well, I think you mean six methods as you’ll have the setters also.

ruby-1.9.2-p0 > class Entry
=> [:subject, :subject=, :affiliate, :affiliate=, :address, :address=,
:initialize_clone, :taint, :tainted?, :untaint, :untrust, :untrusted?,
ruby-1.9.2-p0 >
self.class.instance_methods(false).grep(/=/).each do |name|
irb> Entry.instance_methods(false)
=> [:subject, :subject=, :affiliate, :affiliate=, :address, :address=]
irb> e = Entry.new(:address => ‘123 Main St.’)
no value given for subject
no value given for affiliate
address= 123 Main St.
=> #<Entry:0x1e73f0 @address=“123 Main St.”>

Ah - right, six methods. This is great, just tried, thanks!