Rails db: migración abortando ... no estoy seguro de por qué o cómo solucionarlo

Question

Así que soy realmente nuevo en Rails, y me aparece un error extraño que no entiendo. Creé un modelo de evento y quiero migrarlo a mi base de datos. Sin embargo, cuando corro bundle exec rake db:migrate --trace esto es lo que me sale:

05:55 PM movienights: bundle exec rake db:migrate --trace 
** Invoke db:migrate (first_time) 
** Invoke environment (first_time) 
** Execute environment 
** Invoke db:load_config (first_time) 
** Invoke rails_env (first_time) 
** Execute rails_env 
** Execute db:load_config 
** Execute db:migrate 
== CreateEvents: migrating =================================================== 
-- create_table(:events) 
rake aborted! 
An error has occurred, all later migrations canceled: 

    undefined method `name' for #<ActiveRecord::ConnectionAdapters::TableDefinition:0x007ffa75a27660> 
    Documents/Homework/College/2011-2012/Rails/RailsApps/movienights/db/migrate/20120331213639_create_events.rb:4:in `block in change' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/connection_adapters/abstract/schema_statements.rb:160:in `create_table' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:432:in `create_table' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:450:in `block in method_missing' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:424:in `block in say_with_time' 
    .rvm/rubies/ruby-1.9.2-p318/lib/ruby/1.9.1/benchmark.rb:295:in `measure' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:424:in `say_with_time' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:444:in `method_missing' 
    Documents/Homework/College/2011-2012/Rails/RailsApps/movienights/db/migrate/20120331213639_create_events.rb:3:in `change' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:393:in `block (2 levels) in migrate' 
    .rvm/rubies/ruby-1.9.2-p318/lib/ruby/1.9.1/benchmark.rb:295:in `measure' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:393:in `block in migrate' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:118:in `with_connection' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:377:in `migrate' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:512:in `migrate' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:704:in `block (2 levels) in migrate' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:761:in `call' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:761:in `ddl_transaction' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:703:in `block in migrate' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:684:in `each' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:684:in `migrate' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:554:in `up' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:535:in `migrate' 
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/railties/databases.rake:153:in `block (2 levels) in <top (required)>' 
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `call' 
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `block in execute' 
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each' 
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `execute' 
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain' 
    .rvm/rubies/ruby-1.9.2-p318/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize' 
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain' 
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:144:in `invoke' 
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:116:in `invoke_task' 
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block (2 levels) in top_level' 
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `each' 
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block in top_level' 
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling' 
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:88:in `top_level' 
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:66:in `block in run' 
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling' 
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run' 
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>' 
    .rvm/gems/ruby-1.9.2-p318/bin/rake:19:in `load' 
    .rvm/gems/ruby-1.9.2-p318/bin/rake:19:in `<main>' 
    Tasks: TOP => db:migrate 

Cuando corro bundle exec rake, me sale:

You have 1 pending migrations: 
    20120331213639 CreateEvents 
Run `rake db:migrate` to update your database then try again. 

mis Crear migración de eventos es:

class CreateEvents < ActiveRecord::Migration 
    def change 
    create_table :events do |t| 
     t.name :string 
     t.date :datetime 
     t.location :string 

     t.timestamps 
    end 
    end 
end 

Sin embargo, eliminó el modelo de evento usando rails destroy scaffold Event y lo volvió a hacer con diferentes propiedades. Podría ser esto parte del problema?

¡Cualquier ayuda o sugerencia es muy apreciada!

Answer 1

Orden incorrecto al declarar atributos en la migración. Debe ser:

t.string :name 

Lo mismo para sus otros atributos. También cambie el nombre del atributo de fecha a otra cosa, porque es un nombre de clave preservado que nunca debe usar.

Parece que es probable que ejecuta el generador como 'cadena: nombre' en lugar de la correcta 'Nombre: cadena' :)

Answer 2

que tenían el mismo error porque solía mayúsculas en lugar de mínima. Cadena en lugar de cadena.

Answer 3

Tuve el mismo error. Cuando escribí la migración pensé que podría usar "bool" en lugar de booleano. Ese no es el caso. Cuando utilicé los raíles rails g model model_name is_verified:bool no me quejé de la configuración. Pero cuando fui y ejecuté la migración, generé este error. Lo cambié en el archivo de migración a t.boolean y funcionó sin problemas.