Tom,
I don't really know what to think about making a yet new Struts2 oriented
toward JRuby on Rails but I'm sure working on a better integration between
JRuby on Rails and legacy J2EE frameworks such as Struts2 would be indeed
useful.
Some think Rails succeeded mainly because of ActiveRecord. Well the view part
which is 'suboptimal' in Struts as you said is also certainly a reason.
As for reusing the clever declarative validation language from Rails, please,
bare in mind this reply I already gave to the ActiveHibernate (allow using
Hibernate from JRoR) author on the JRuby mailing list:
"I saw a chapter of the 'Rails Recipes' book that could help to do the trick,
it's
called how to use ActiveRecords validations without ActiveRecord. So if ever
that helps here is the recommended way to do. May be you can include or
document this for ActiveHibernate:
the basic trick is to do:
[i]
Problem
You have your own non-database-backed model objects that require
validations. You would like to re-use the ActiveRecord validation frame-
work to declare how these objects should be validated. You also want to
take advantage of the error_messages_on( ) and error_messages_for( ) helpers
in your views.
How do you make your custom model objects work with ActiveRecord
validations?
[...]
make such a module that takes the ActiveRecord validation module:
module Validateable
[:save, :save!, :update_attribute].each{|attr| define_method(attr){}}
def method_missing(symbol, *params)
if(symbol.to_s =~ /(.*)_before_type_cast$/)
send($1)
end
end
def self.append_features(base)
super
base.send(:include, ActiveRecord::Validations)
end
end
Place this module in lib/validateable.rb, and you can mix it into your own
non-ActiveRecord models as needed. Now, in terms of validation and
error reporting, your model is virtually indistinguishable from a real
ActiveRecord model.
Here's an example of a non-ActiveRecord model that supports ActiveRe-
cord validations.
ValidatingNonARObjects/app/models/person.rb
class Person
include Validateable
attr_accessor :age
validates_numericality_of :age
end
To trigger the validations, just call the model's valid?( ) method in your
controllers. This will both return true or false depending on whether
the object passes validations and will populate the model's errors( ) so
that they can be accessed from the ActiveRecord view helpers.
Here's an example of how you can interact with the validations from
the Rails console:
chad> ruby script/console
>> person = Person.new
=> #<Person:0x236e180>
>> person.age = "NOT A NUMBER"
=> "NOT A NUMBER"
>> person.valid?
=> false
>> person.errors
=> #<ActiveRecord::Errors:0x236b430 [EMAIL PROTECTED]"NOT A NUMBER",
@errors=#<ActiveRecord::Errors:0x236b430 ...>>,
@errors={"age"=>["is not a number"]}>
>> person.age = 30
=> 30
>> person.valid?
=> true
>> person.errors
=> #<ActiveRecord::Errors:0x236b430 @base=#<Person:0x236e180 @age=30..>
"[/i]
Hope this will help. Good luck in your implementation. Regards,
Raphael Valyi.
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