Rails 2.3.5 to Rails 3.2 error

Rails
1

I have installed the latest version of rails and jruby. I have copied
all my files from rails 2.3.5 version and am trying to bring all to work
in this version

Project.rb

class Project < ActiveRecord::Base
has_and_belongs_to_many :people
has_many :documents, :conditions => [“project_id =?”, self.id ]
…
…
end

application_helper.rb

def find_projects
user = Person.find(session[:userid])
projects = Project.find(:all)
…
…
…
end

I am getting an error
undefined method `id’ for #Class:0x182237ac (self.id is the problem
guess)

2

deal bitte wrote in post #1070764:

Project.rb

class Project < ActiveRecord::Base
has_and_belongs_to_many :people
has_many :documents, :conditions => [“project_id =?”, self.id ]
…
…
end

application_helper.rb

def find_projects
user = Person.find(session[:userid])
projects = Project.find(:all)
…
…
…
end

I am getting an error
undefined method `id’ for #Class:0x182237ac (self.id is the problem
guess)

Not really answering your question here, but i would restructure some of
this code as follows, to better go with rails 3

class Project < ActiveRecord::Base
has_many :people, :through => ‘people_project_join_table’
has_many :documents #:foreign_key => ‘project_id’ is default for this
relationship. Don’t need.
…
…

def find_projects
user = Person.find(session[:userid])
projects = Project.all
…
…
…
end

Beyond that, whenever you get an error like ‘undefined method for
class’, first make sure you’re in fact working with the class you think
you’re working with by doing myobj.class

a common slip-up for me is trying to use object methods on an array of
said objects. Most scopes and associations will return arrays.

3

I suggest opening your console - type Person - the console should return
to_s of the class - if not, the person model isn’t in your path

better yet, take this opportunity to write some tests - start with the
Person model

4

On Tuesday, July 31, 2012 7:48:08 PM UTC+1, Jodi wrote:

I suggest opening your console - type Person - the console should return
to_s of the class - if not, the person model isn’t in your path

better yet, take this opportunity to write some tests

+1

has_many :documents, :conditions => [“project_id =?”, self.id ]

What does self.id refer to here? Has the project class been instantiated
yet to make it available? Is it required?

5

Hello,

Your class Project does not have a method by the name ‘id’. Please
review
the logic of your code :slight_smile: