Uninitialized constant when trying to migrate files

Rails
1

Hi,

i am having this problem:

kevinngsw$ rake db:migrate --trace
(in /Users/kevinngsw/Documents/Programming/*******)
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute db:migrate
rake aborted!
An error has occurred, this and all later migrations canceled:

uninitialized constant CreateUrls
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:443:in
load_missing_constant' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:80:inconst_missing’
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:92:in
const_missing' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/inflector.rb:361:inconstantize’
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/inflector.rb:360:in
each' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/inflector.rb:360:inconstantize’
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/core_ext/string/inflections.rb:162:in
constantize' /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/migration.rb:374:inload_migration’
/usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/migration.rb:369:in
migration' /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/migration.rb:365:inmigrate’
/usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/migration.rb:486:in
migrate' /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/migration.rb:560:incall’
/usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/migration.rb:560:in
ddl_transaction' /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/connection_adapters/abstract/database_statements.rb:136:intransaction’
/usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/transactions.rb:182:in
transaction' /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/migration.rb:560:inddl_transaction’
/usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/migration.rb:485:in
migrate' /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/migration.rb:472:ineach’
/usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/migration.rb:472:in
migrate' /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/migration.rb:400:inup’
/usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/migration.rb:383:in
migrate' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/tasks/databases.rake:116 /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:incall’
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in
execute' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:ineach’
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in
execute' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:ininvoke_with_call_chain’
/usr/local/lib/ruby/1.8/monitor.rb:242:in synchronize' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:ininvoke_with_call_chain’
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in invoke' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:ininvoke_task’
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in
top_level' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:ineach’
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in
top_level' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:instandard_exception_handling’
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in
top_level' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:inrun’
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in
standard_exception_handling' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:inrun’
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31
/usr/local/bin/rake:19:in `load’
/usr/local/bin/rake:19

this is the migration file:

class CreateURLs < ActiveRecord::Migration
def self.up
create_table :urls do |t|
t.string :label
t.string :url

  t.timestamps
end

end

def self.down
drop_table :urls
end
end

this is the model file:

class URL < ActiveRecord::Base
belongs_to :contact_person
end

any help is appreciated. Thanks!!

2

whats the name of your file? looking at the class it should be named
*_create_u_r_ls.rb. if it is called *_create_urls.rb then your class
should be CreateUrls. smae with your model. try Url instead of URL.

3

On May 5, 7:36 am, Kevin Ng [email protected] wrote:

this is the migration file:

class CreateURLs < ActiveRecord::Migration

Assuming the file is some_number_create_urls.rb Rails is expecting the
migration class to be CreateUrls (similarly rails will expect to find
a model class called Url in url.rb)

Fred