No key set in openstruct ?

[jney]

Hello,

Is there a cleaner way to check if no field have been set than the
following code ?
=> true

 

[Robert Klemme]

Is there a cleaner way to check if no field have been set than the
following code ?

=> true

I'd consider this a tad cleaner - although it is not really rock solid:

irb(main):015:0> x.methods - x.class.instance_methods
=> [:foo, :foo=]
irb(main):016:0> x = OpenStruct.new
=> #<OpenStruct>
irb(main):017:0> x.foo = 1
=> 1
irb(main):018:0> x.methods - x.class.instance_methods
=> [:foo, :foo=]

Kind regards

robert

 

[jney]

   Is there a cleaner way to check if no field have been set than the
following code ?

=>  true

I'd consider this a tad cleaner - although it is not really rock solid:

irb(main):015:0> x.methods - x.class.instance_methods
=> [:foo, :foo=]
irb(main):016:0> x = OpenStruct.new
=> #<OpenStruct>
irb(main):017:0> x.foo = 1
=> 1
irb(main):018:0> x.methods - x.class.instance_methods
=> [:foo, :foo=]

Kind regards

        robert

Thank you Robert.
The problem with this method is that the field definition is still
remaining even after delete :

x = OpenStruct.new

x.foo=1 => 1
x.methods - x.class.instance_methods => [:foo, :foo=]
x.delete_field :foo => 1
x.methods - x.class.instance_methods

=> [:foo, :foo=]

 

[Robert Dober]

x.foo=1 => 1
x.methods - x.class.instance_methods => [:foo, :foo=]
x.delete_field :foo => 1
x.methods - x.class.instance_methods

=> [:foo, :foo=]

Hmm I'd consdider this a bug, maybe report this to ruby-core
Cheers
Robert