Google-maps-for-Rails - undefined method `gmaps' for (object) in rake task

Question

When I run a rake task that involves a model with gmaps4rails enabled I get this error, and if I comment the model so it's not acts_as_gmappable it completes properly.

enter code here
troy$ rake populate:scans --trace
** Invoke populate:scans (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute populate:scans
http://goo.gl/fb/977ze
Sat, 16 Jul 2011 19:43:59 GMT
47.676506
-122.121872
91df0f32209c5212XXXXXXXXXXXXXXX
rake aborted!

undefined method `gmaps' for #<Scan:0x000001051fb9a8>
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activemodel-3.0.9/lib/active_model/attribute_methods.rb:392:in `method_missing'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.9/lib/active_record/attribute_methods.rb:46:in `method_missing'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/gmaps4rails-0.9.1/lib/gmaps4rails/acts_as_gmappable.rb:12:in `process_geocoding'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.9/lib/active_support/callbacks.rb:415:in `_run_validate_callbacks'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activemodel-3.0.9/lib/active_model/validations.rb:212:in `run_validations!'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activemodel-3.0.9/lib/active_model/validations/callbacks.rb:67:in `block in run_validations!'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.9/lib/active_support/callbacks.rb:414:in `_run_validation_callbacks'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activemodel-3.0.9/lib/active_model/validations/callbacks.rb:67:in `run_validations!'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activemodel-3.0.9/lib/active_model/validations.rb:179:in `valid?'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.9/lib/active_record/validations.rb:55:in `valid?'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.9/lib/active_record/validations.rb:75:in `perform_validations'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.9/lib/active_record/validations.rb:43:in `save'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.9/lib/active_record/attribute_methods/dirty.rb:21:in `save'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.9/lib/active_record/transactions.rb:240:in `block (2 levels) in save'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.9/lib/active_record/transactions.rb:292:in `block in with_transaction_returning_status'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.9/lib/active_record/connection_adapters/abstract/database_statements.rb:139:in `transaction'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.9/lib/active_record/transactions.rb:207:in `transaction'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.9/lib/active_record/transactions.rb:290:in `with_transaction_returning_status'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.9/lib/active_record/transactions.rb:240:in `block in save'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.9/lib/active_record/transactions.rb:251:in `rollback_active_record_state!'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.9/lib/active_record/transactions.rb:239:in `save'
/Users/troy/Documents/projects/qrbrowser/lib/tasks/populate.rake:42:in `block (3 levels) in <top (required)>'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/nokogiri-1.5.0/lib/nokogiri/xml/node_set.rb:239:in `block in each'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/nokogiri-1.5.0/lib/nokogiri/xml/node_set.rb:238:in `upto'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/nokogiri-1.5.0/lib/nokogiri/xml/node_set.rb:238:in `each'
/Users/troy/Documents/projects/qrbrowser/lib/tasks/populate.rake:23:in `block (2 levels) in <top (required)>'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/task.rb:205:in `call'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/task.rb:205:in `block in execute'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/task.rb:200:in `each'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/task.rb:200:in `execute'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/Users/troy/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/task.rb:144:in `invoke'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/application.rb:112:in `invoke_task'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/application.rb:90:in `block (2 levels) in top_level'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/application.rb:90:in `each'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/application.rb:90:in `block in top_level'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/application.rb:84:in `top_level'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/application.rb:62:in `block in run'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/lib/rake/application.rb:59:in `run'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2/bin/rake:32:in `<top (required)>'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/bin/rake:19:in `load'
/Users/troy/.rvm/gems/ruby-1.9.2-p180/bin/rake:19:in `<main>'
Tasks: TOP => populate:scans

Answer 1

Solution 1:

acts_as_gmappable :process_geocoding => false

Solution 2:

When you're creating an instance of your model, do:

@scan.instance_eval do
  def process_geocoding
    true
  end
end