Conflicting definitions between ActiveRecord and QT

I am somewhat of a Ruby newbie, so if this question is in the wrong
forum please let me know.

  The specific problem I have is ActiveRecord + QT, but the problem is
generic and I am asking how to solve similar issues as well.

  So I started experimenting with Ruby a bit and I was trying to play
with ActiveRecord.
  My first thought was to play with ActiveRecord and understand it
separate from all the Rails infrastructure.
  I install ruby 1.9.1, ruby qtbindings, and read up some qt tutorials
and I am ready to rock.

  Even the simplest program throws an error when I try to mix qt and
active record.

  The following lines do not work.

require 'active_record'
require 'Qt4'
require 'sqlite3'

class Review < ActiveRecord::Base
end

  I get the error:
/usr/local/rvm/gems/ruby-1.9.2-p0/gems/qtbindings-4.6.3.2/lib/Qt/qtruby4.rb:3164:in
`constants': wrong number of arguments (1 for 0) (ArgumentError)
        from
/usr/local/rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.3/lib/active_support/core_ext/module/introspection.rb:79:in
`local_constants'

  Basically there is a constants defined for Module in qtruby4.rb as
well as introspection.rb
  How can I go about resolving such a conflict. As far as I can see
there are no modules used, just on giant C like global namespace. Is
there any way I can separate qt and active record by namespace ?

  Any suggestions for further research would be very helpful.

  Thanks !

···

--
Posted via http://www.ruby-forum.com/.

In ruby 1.8, Module#constants takes no arguments and qt-ruby redefines it in
the same way. However, in ruby 1.9, Module#constants takes one argument (which
is why activesupport calls it with one), but qt-ruby doesn't take this into
account when redefining it. I'd say this is a bug in qt-ruby and will report
it to the developers. In the meantime, I think you can solve your issue
redefining it yourself before requiring activesupport:

require 'activesupport'
require 'Qt4'

class Module

  alias_method :constants_defined_by_qt, :constants
  def constants inherit=true
    constants_defined_by_qt
  end

end

I hope this helps

Stefano

···

On Tuesday 14 December 2010 13:19:29 Emil Macarie wrote:

I am somewhat of a Ruby newbie, so if this question is in the wrong
forum please let me know.

  The specific problem I have is ActiveRecord + QT, but the problem is
generic and I am asking how to solve similar issues as well.

  So I started experimenting with Ruby a bit and I was trying to play
with ActiveRecord.
  My first thought was to play with ActiveRecord and understand it
separate from all the Rails infrastructure.
  I install ruby 1.9.1, ruby qtbindings, and read up some qt tutorials
and I am ready to rock.

  Even the simplest program throws an error when I try to mix qt and
active record.

  The following lines do not work.

require 'active_record'
require 'Qt4'
require 'sqlite3'

class Review < ActiveRecord::Base
end

  I get the error:
/usr/local/rvm/gems/ruby-1.9.2-p0/gems/qtbindings-4.6.3.2/lib/Qt/qtruby4.rb:
3164:in `constants': wrong number of arguments (1 for 0) (ArgumentError)
        from
/usr/local/rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.3/lib/active_suppor
t/core_ext/module/introspection.rb:79:in `local_constants'

  Basically there is a constants defined for Module in qtruby4.rb as
well as introspection.rb
  How can I go about resolving such a conflict. As far as I can see
there are no modules used, just on giant C like global namespace. Is
there any way I can separate qt and active record by namespace ?

  Any suggestions for further research would be very helpful.

  Thanks !

Stefano Crocco wrote in post #968233:

···

On Tuesday 14 December 2010 13:19:29 Emil Macarie wrote:

  I install ruby 1.9.1, ruby qtbindings, and read up some qt tutorials

  Basically there is a constants defined for Module in qtruby4.rb as
well as introspection.rb
  How can I go about resolving such a conflict. As far as I can see
there are no modules used, just on giant C like global namespace. Is
there any way I can separate qt and active record by namespace ?

  Any suggestions for further research would be very helpful.

  Thanks !

In ruby 1.8, Module#constants takes no arguments and qt-ruby redefines
it in
the same way. However, in ruby 1.9, Module#constants takes one argument
(which
is why activesupport calls it with one), but qt-ruby doesn't take this
into
account when redefining it. I'd say this is a bug in qt-ruby and will
report
it to the developers. In the meantime, I think you can solve your issue
redefining it yourself before requiring activesupport:

require 'activesupport'
require 'Qt4'

class Module

  alias_method :constants_defined_by_qt, :constants
  def constants inherit=true
    constants_defined_by_qt
  end

end

I hope this helps

Stefano

Thank you for your help. I will give that a shot as soon as I get back
to my Ruby environment.

I'll also try to see if I can get something working where constants with
no arguments and constants with an argument point to different
functions.

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