Controller Models

Rails
1

Here I Just started to learn Ruby on Rails! My issues is when reading
the data using my controller pages.

I initiate my controller using this command

rails g controller schoolTypes

I then initiate my model has the following command

rails g model schoolType

Once this is done i then modify has follow the following pages

create_school_type
class CreateSchoolTypes < ActiveRecord::Migration
def change
create_table :school_types do |t|
t.integer :schoolTypeID
t.string :name
t.description :text

  t.timestamps
end

end
end
did a rake db:migrate

Change the following page

school_types_controller.rb
class SchoolTypesController < ApplicationController
def index
@schoolTypes = schooltype.all
end
def show
end
def new
end
def create
end
def update
end
def destroy
end
def edit
end
end

index.html.erb

School Types

<% @schoolTypes.each do |schoolType|%> <%= schoolTypes.name %> <% end %> If I go to the following page http://localhost:3000/school_types I get the following errors undefined local variable or method `schooltype' for #

Any reason why?

2

your model should call ‘SchoolType’ and it’s in file
app/models/school_type.rb

then you should use @types = SchoolType.all (case sensitive)

tom

On Jul 9, 2012, at 21:13 , Jean-Sbastien D. wrote:

 t.timestamps

@schoolTypes = schooltype.all
end
the following errors
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3

On 9 July 2012 20:13, Jean-Sbastien D. [email protected] wrote:

Once this is done i then modify has follow the following pages

create_school_type
class CreateSchoolTypes < ActiveRecord::Migration
def change
create_table :school_types do |t|
t.integer :schoolTypeID

You don’t need this as an id field will automatically be added. Also
life will be simpler if you stick to the rails conventions for naming
things (don’t use camelCase), if you needed a school type id it should
be called school_type_id.

I suggest you work right through some tutorials on RoR in order to get
the basic principles. railstutorial.org is good and is free to use
online (how many times have I typed that in the last year I wonder, my
fingers type it without conscious brain involvement). Also have a
look at the Rails Guides, starting with Getting Started, obviously.

Colin

4

Rails uses four naming conventions for throughout it’s code which need
to
be followed by the developer (you) for their code to fit with Rails.
These
involve selective use or* singular* and *plural *together with
camelizeand
underscore.

The simplest way to demonstrate the conventional use is to run:
rails generate scaffold your_new_object name:string
description:text size:integer

Then look at the model/view/controller files for uses of the variants on
*
your_new_object
your_new_object
your_new_objects
YourNewObject
YourNewObjects

*If you’re running on a unix system (any Linux or OSX) this command will
find them all when run within your application directory:
find . -name *.rb -exec grep your_new {} ; -a -exec grep
YourNew
{} ; -a -print

Rick

5

Thanks it works, it just get confusing with the singular and plurials.
To be clear here how I declared my controller

rails g controller School_Types

and my model is as follow

rails g model School_Type

I am on a linux system. I also understand that the id field is
automatically integrated but when reading the file all I see is

create_school_type
class CreateSchoolTypes < ActiveRecord::Migration
def change
create_table :school_types do |t|
t.integer :schoolTypeID
t.string :name
t.description :text

  t.timestamps
end

end
end

I see the timestamps which allows me to see created and modified at, but
coming from php and mysql, if i dont have schoolTypeID where is the id??
is it not created into that file or is it created when running rake
db:migrate