I am trying to implement a rails Recipe application from the site http://oreilly.com/ruby/archive/rails-revisited.html . They have given a good example highlighting the significance of Rails for Agile Development. The example in this post is implemented in Rails version lesser than 1.x.
I am trying to implement the same in version 2.0.2. They seem to have implement it using MySql 4.1 Database. I am currently using mysql-client 5.1 on the Ubuntu 10.04 platform. I am facing certain errors When I am trying to use rake db:migrate.
I initially encountered errors even while manually creating the database tables. Seems that the syntax for creating the DB tables has changed for certain attributes. For e.g.
The command in the post to create the Recipes Table didn’t work for me
create table recipes (
id int not null auto_increment,
category_id int not null,
title varchar(100) not null default '',
description varchar(255) null,
date date null,
instructions text null,
constraint fk_recipes_categories foreign key (category_id) references categories(id),
primary key(id)
) engine=InnoDB;
Until I changed few things in the syntax to suit version 5.1. The command which did the trick for me was:
create table recipes ( id int not null auto_increment, category_id int not null, title varchar(100) not null default '', description varchar(255) null, date date null, instructions text null, primary key (id), constraint fk_recipes_categories foreign key (category_id) references categories(id)) engine=InnoDB;
Now back to my question. I was actually trying to do some kind of reverse engineering just in order to understand how scaffold works. Inititally I wanted to understand its significance so I tried doing things manually..
I then tried doing things using the scaffold command and I am currently stuck with rake db:migrate. I know it might seem a bit too much a reference and a too big a question , but I guess you would need to check this out so that you could probably tell me what change do I need to incorporate in order to get my tables created using rake db:migrate
mohnish@pc146724-desktop:~/railsprg/2011/Jan11/12jan11_recipes/cookbook2$ script/generate scaffold category id:integer name:string
/usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/rails_generator/lookup.rb:207:Warning: Gem::SourceIndex#search support for Regexp patterns is deprecated, use #find_name
exists app/models/
exists app/controllers/
exists app/helpers/
create app/views/categories
exists app/views/layouts/
exists test/functional/
exists test/unit/
create app/views/categories/index.html.erb
create app/views/categories/show.html.erb
create app/views/categories/new.html.erb
create app/views/categories/edit.html.erb
create app/views/layouts/categories.html.erb
create public/stylesheets/scaffold.css
dependency model
/usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/rails_generator/lookup.rb:207:Warning: Gem::SourceIndex#search support for Regexp patterns is deprecated, use #find_name
exists app/models/
exists test/unit/
exists test/fixtures/
create app/models/category.rb
create test/unit/category_test.rb
create test/fixtures/categories.yml
create db/migrate
create db/migrate/001_create_categories.rb
create app/controllers/categories_controller.rb
create test/functional/categories_controller_test.rb
create app/helpers/categories_helper.rb
route map.resources :categories
mohnish@pc146724-desktop:~/railsprg/2011/Jan11/12jan11_recipes/cookbook2$ script/generate scaffold recipe id:integer category_id:integer title:string description:text date:date instructions:text
/usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/rails_generator/lookup.rb:207:Warning: Gem::SourceIndex#search support for Regexp patterns is deprecated, use #find_name
exists app/models/
exists app/controllers/
exists app/helpers/
create app/views/recipes
exists app/views/layouts/
exists test/functional/
exists test/unit/
create app/views/recipes/index.html.erb
create app/views/recipes/show.html.erb
create app/views/recipes/new.html.erb
create app/views/recipes/edit.html.erb
create app/views/layouts/recipes.html.erb
identical public/stylesheets/scaffold.css
dependency model
/usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/rails_generator/lookup.rb:207:Warning: Gem::SourceIndex#search support for Regexp patterns is deprecated, use #find_name
exists app/models/
exists test/unit/
exists test/fixtures/
create app/models/recipe.rb
create test/unit/recipe_test.rb
create test/fixtures/recipes.yml
exists db/migrate
create db/migrate/002_create_recipes.rb
create app/controllers/recipes_controller.rb
create test/functional/recipes_controller_test.rb
create app/helpers/recipes_helper.rb
route map.resources :recipes
mohnish@pc146724-desktop:~/railsprg/2011/Jan11/12jan11_recipes/cookbook2$ rake db:create
(in /home/mohnish/railsprg/2011/Jan11/12jan11_recipes/cookbook2)
"db/development.sqlite3 already exists"
mohnish@pc146724-desktop:~/railsprg/2011/Jan11/12jan11_recipes/cookbook2$ rake db:create
(in /home/mohnish/railsprg/2011/Jan11/12jan11_recipes/cookbook2)
mohnish@pc146724-desktop:~/railsprg/2011/Jan11/12jan11_recipes/cookbook2$ rake db:migrate
(in /home/mohnish/railsprg/2011/Jan11/12jan11_recipes/cookbook2)
== 1 CreateCategories: migrating ==============================================
-- create_table(:categories)
rake aborted!
Mysql::Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(11), `name` varchar(255) DEFAULT NULL, `created_at` datetime DEFAULT NULL, `upd' at line 1: CREATE TABLE `categories` (`id` int(11) DEFAULT NULL auto_increment PRIMARY KEY(11), `name` varchar(255) DEFAULT NULL, `created_at` datetime DEFAULT NULL, `updated_at` datetime DEFAULT NULL) ENGINE=InnoDB
(See full trace by running task with --trace)
mohnish@pc146724-desktop:~/railsprg/2011/Jan11/12jan11_recipes/cookbook2$ rake db:migrate --trace
(in /home/mohnish/railsprg/2011/Jan11/12jan11_recipes/cookbook2)
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute db:migrate
== 1 CreateCategories: migrating ==============================================
-- create_table(:categories)
rake aborted!
Mysql::Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(11), `name` varchar(255) DEFAULT NULL, `created_at` datetime DEFAULT NULL, `upd' at line 1: CREATE TABLE `categories` (`id` int(11) DEFAULT NULL auto_increment PRIMARY KEY(11), `name` varchar(255) DEFAULT NULL, `created_at` datetime DEFAULT NULL, `updated_at` datetime DEFAULT NULL) ENGINE=InnoDB
/usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/connection_adapters/abstract_adapter.rb:150:in `log'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/connection_adapters/mysql_adapter.rb:281:in `execute'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/connection_adapters/abstract/schema_statements.rb:104:in `create_table'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/connection_adapters/mysql_adapter.rb:416:in `create_table'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/migration.rb:285:in `send'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/migration.rb:285:in `method_missing'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/migration.rb:265:in `say_with_time'
/usr/lib/ruby/1.8/benchmark.rb:293:in `measure'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/migration.rb:265:in `say_with_time'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/migration.rb:281:in `method_missing'
./db/migrate//001_create_categories.rb:3:in `up_without_benchmarks'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/migration.rb:219:in `send'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/migration.rb:219:in `migrate'
/usr/lib/ruby/1.8/benchmark.rb:293:in `measure'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/migration.rb:219:in `migrate'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/migration.rb:348:in `migrate'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/migration.rb:339:in `each'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/migration.rb:339:in `migrate'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/migration.rb:307:in `up'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/migration.rb:298:in `migrate'
/usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/tasks/databases.rake:85
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain'
/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `each'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:in `run'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31
/usr/bin/rake:19:in `load'
/usr/bin/rake:19
mohnish@pc146724-desktop:~/railsprg/2011/Jan11/12jan11_recipes/cookbook2$
The db/migrate/001_create_categories.rb & db/migrate/002_create_recipes.rb looks like this:
class CreateCategories < ActiveRecord::Migration
def self.up
create_table :categories do |t|
t.integer :id
t.string :name
t.timestamps
end
end
def self.down
drop_table :categories
end
end
class CreateRecipes < ActiveRecord::Migration
def self.up
create_table :recipes do |t|
t.integer :id
t.integer :category_id
t.string :title
t.text :description
t.date :date
t.text :instructions
t.timestamps
end
end
def self.down
drop_table :recipes
end
end
Thanks for you help..
You don’t need
t.integer :idin your migrations, you get that for free. Remove it.http://guides.rubyonrails.org/v2.3.8/migrations.html is a great resource.