Question

Okay so I was just starting this rails app and generated my first model

ruby script/generate model Grid req:string class:string ctitle:string credits:float grade:string pass:boolean

created my table

rake db:migrate
(in C:/Users/Michael/InstantRails/rails_apps/studentGrid)
== CreateGrids: migrating ====================================================
— create_table(:grids)
-> 0.0150s
== CreateGrids: migrated (0.0150s) ===========================================

and went to the console to add some data to my table

Grid
=> Grid(id: integer, req: string, class: string, ctitle: string, credits: float,
grade: string, pass: boolean, created_at: datetime, updated_at: datetime)
Grid.create(:req=>”Math Elective”, :class=>”Math 111″, :ctitle=>”Calculus I”, :credits=>3.0)

Pretty standard I thought, but then I get this error and I don’t understand why

NoMethodError: undefined method 'generated_methods' for nil:NilClass
from C:/Users/Michael/InstantRails/ruby/lib/ruby/gems/1.8/gems/activesup
port-2.3.5/lib/active_support/whiny_nil.rb:52:inmethod_missing’
from C:/Users/Michael/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerec
ord-2.3.5/lib/active_record/attribute_methods.rb:352:in respond_to?'
from C:/Users/Michael/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerec
ord-2.3.5/lib/active_record/base.rb:2746:inattributes=’
from C:/Users/Michael/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerec
ord-2.3.5/lib/active_record/base.rb:2742:in each'
from C:/Users/Michael/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerec
ord-2.3.5/lib/active_record/base.rb:2742:inattributes=’
from C:/Users/Michael/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerec
ord-2.3.5/lib/active_record/base.rb:2438:in initialize'
from C:/Users/Michael/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerec
ord-2.3.5/lib/active_record/base.rb:721:innew’
from C:/Users/Michael/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerec
ord-2.3.5/lib/active_record/base.rb:721:in `create’
from (irb):2
from :0

Answer 1

I’d try renaming the class column to something else. See here for other terms to avoid.