Initial commit

.gitignore

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+*.swp
+*.swo
+*.gem
+.bundle

README.md

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+## DatabaseValidation
+
+We write a lot of validations in our ActiveRecord models that already exist inside of our database.  This gem seeks to automatically create those validations.
+
+### Usage
+
+    class Thing < ActiveRecord::Base
+      include DatabaseValidation
+    end
+
+### What's automatically created
+
+For now:
+
+* validates_uniquness_of (with scope)
+* validates_presence_of 
+* validates_length_of :maximum
+
+In the future:
+
+* all associations
+
+### Installation
+
+    gem 'database_validation'
+
+### Author
+
+John Crepezzi <john.crepezzi@gmail.com>

Rakefile

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+require 'spec/rake/spectask'
+require File.dirname(__FILE__) + '/lib/database_validation/version'
+
+task :build  do
+  system "gem build database_validation.gemspec"
+end
+
+task :release => :build do
+  # tag and push
+  system "git tag v#{DatabaseValidation::version}"
+  system "git push origin --tags"
+  # push the gem
+  system "gem push database_validation-#{DatabaseValidation::version}.gem"
+end
+
+Spec::Rake::SpecTask.new(:test) do |t|
+  t.spec_files = FileList['spec/**/*_spec.rb']
+  fail_on_error = true # be explicit
+end
+
+Spec::Rake::SpecTask.new(:rcov) do |t|
+  t.spec_files = FileList['spec/**/*_spec.rb']
+  t.rcov = true
+  fail_on_error = true # be explicit
+end

database_validation.gemspec

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+require File.dirname(__FILE__) + '/lib/database_validation/version'
+
+spec = Gem::Specification.new do |s|  
+  s.name = 'database_validation'
+  s.author = 'John Crepezzi'
+  s.add_development_dependency('rspec')
+  s.description = 'Automatically pull validations out of your database and apply them to your models'
+  s.email = 'john.crepezzi@gmail.com'
+  s.files = Dir['lib/**/*.rb']
+  s.homepage = 'http://seejohnrun.github.com/database_validation/'
+  s.platform = Gem::Platform::RUBY
+  s.require_paths = ['lib']
+  s.summary = 'Automatic Rails validations from your database'
+  s.test_files = Dir.glob('spec/*.rb')
+  s.version = DatabaseValidation::version
+  s.rubyforge_project = "database_validation"
+end
+

lib/database_validation.rb

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+require 'active_record'
+
+module DatabaseValidation
+
+  def self.included(base)
+    @base = base
+    Detector.detect_validations(@base)
+  end
+
+  # tested with 'mysql' and 'mysql2' adapters
+  module Detector
+
+    def self.detect_validations(base)
+      base.columns.each do |field|
+        next if field.name == base.primary_key # don't add validations here
+        allow_nil = field.null
+        base.send(:validates_length_of, field.name.to_sym, :maximum => field.limit, :allow_nil => allow_nil)
+        base.send(:validates_presence_of, field.name.to_sym, :allow_nil => allow_nil) unless allow_nil
+      end
+      ActiveRecord::Base.connection.indexes(base.table_name).each do |key|
+        col_syms = key.columns.map(&:to_sym)
+        base.send(:validates_uniqueness_of, col_syms.first.to_sym, :scope => col_syms.slice(1, -1)) if key.unique
+      end
+    end
+
+  end
+
+end

lib/database_validation/version.rb

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+module DatabaseValidation
+
+  def self.version
+    VERSION.join('.')
+  end
+
+  private
+
+  VERSION = [0, 0, 1]
+
+end

spec/examples/validates_length_of_spec.rb

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+require File.dirname(__FILE__) + '/../spec_helper'
+
+describe DatabaseValidation do
+
+  before(:all) do
+    execute 'create table length1s (id int(11) auto_increment primary key, name varchar(10))'
+  end
+
+  before(:all) do
+    class Length1 < ActiveRecord::Base
+      include DatabaseValidation
+    end
+  end
+
+  after(:all) do
+    execute 'drop table length1s'
+  end
+
+  it 'should be able to automatically detect validations' do
+    lambda do
+      Length1.create!(:name => 'this name is too long')
+    end.should raise_error(ActiveRecord::RecordInvalid)
+  end
+
+end

spec/examples/validates_presence_of_spec.rb

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+require File.dirname(__FILE__) + '/../spec_helper'
+
+describe DatabaseValidation do
+
+  before(:all) do
+    execute 'create table presence1s (id int(11) auto_increment primary key, name varchar(10) NOT NULL)'
+  end
+
+  before(:all) do
+    class Presence1 < ActiveRecord::Base
+      include DatabaseValidation
+    end
+  end
+
+  after(:all) do
+    execute 'drop table presence1s'
+  end
+
+  it 'should be automatically able to detect null validations' do
+    lambda do
+      Presence1.create!
+    end.should raise_error(ActiveRecord::RecordInvalid)
+  end
+
+end

spec/examples/validates_uniqueness_of_spec.rb

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+require File.dirname(__FILE__) + '/../spec_helper'
+
+describe DatabaseValidation do
+
+  before(:all) do
+    execute 'create table unique1s (id int(11) auto_increment primary key, name varchar(10))'
+    execute 'create unique index name_unique on unique1s (name)'
+  end
+
+  before(:all) do
+    class Unique1 < ActiveRecord::Base
+      include DatabaseValidation
+    end
+  end
+
+  after(:all) do
+    execute 'drop table unique1s'
+  end
+
+  it 'should not allow two of the same record when validates_uniqueness_of is around' do
+    Unique1.create!(:name => 'john')
+    lambda do
+      Unique1.create!(:name => 'john')
+    end.should raise_error(ActiveRecord::RecordInvalid)
+  end
+
+end
+

spec/spec_helper.rb

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+require File.dirname(__FILE__) + '/../lib/database_validation'
+
+ActiveRecord::Base.establish_connection(:adapter => 'mysql', :database => 'johnsql')
+
+def execute(sql)
+  ActiveRecord::Base.connection.execute(sql)
+end