A simple implementation of the ActiveRecord Tableless pattern for any Rails project or other Ruby project that uses ActiveRecord.
Why, why, why
Why would you ever consider this gem as opposed to ActiveModel?
ActiveModel::Model does not support relations and nested attributes.
ActiveRecord Tablefree is distributed as a gem, which is how it should be used in your app.
Include the gem in your Gemfile:
gem "activerecord-tablefree", "~> 3.0"
Supported ruby version are
- 2.2.x series higher than 2.2.2 (a Rails 5 requirement)
- 2.3.x series
- 2.4.x series
- 2.5.x series
Supported ActiveRecord versions are
- 5.0.x series
- 5.1.x series
- 5.2.x series
If you are using an older ActiveRecord version you can use the gem
This gem tries to maintain the same API as the older
Define a model like this:
class ContactMessage < ActiveRecord::Base has_no_table column :name, :string column :email, :string column :message, :string validates_presence_of :name, :email, :message end
You can now use the model in a view like this:
<%= form_for :contact_message, @contact_message do |f| %> Your name: <%= f.text_field :name %> Your email: <%= f.text_field :email %> Your message: <%= f.text_field :message %> <% end %>
And in the controller:
def contact_message @contact_message = ContactMessage.new if request.post? @contact_message.attributes = params[:contact_message] if @contact_message.valid? # Process the message... end end end
If you wish (this is not recommended), you can pretend you have a succeeding database by using
has_no_table :database => :pretend_success
Some model as before, but with an association to a real DB-backed model.
class ContactMessage < ActiveRecord::Base has_no_table column :message, :string column :email, :string validates_presence_of :name, :email belongs_to :contact, foreign_key: :email, primary_key: :email end class Contact < ActiveRecord::Base validates_presence_of :name, :email has_one :contact_message, foreign_key: :email, primary_key: :email, dependent: nil end
Obviously the association is not full-fledged, as some traversals just won't make sense with one side not being loadable from the database. From the
ContactMessage you can get to the
Contact, but not vice versa.
>> contact = Contact.new(name: 'Boo', email: 'email@example.com') >> contact_message = ContactMessage.new(contact: contact) >> contact_message.email => 'firstname.lastname@example.org'
To start developing, please download the source code
git clone git://github.com/pboling/activerecord-tablefree.git
Install development libraries
sudo apt-get install -y libsqlite3-dev libxml2-dev libxslt-dev
When downloaded, you can start issuing the commands like
bundle install bundle update bundle exec appraisal generate bundle exec appraisal install bundle exec appraisal rake all
Or you can see what other options are there:
bundle exec rake -T
gem bump -v pre
Verify everything is OK.
gem build activerecord-tablefree.gemspec
Verify everything is OK.
gem release -t
Originally this code was implemented for Rails 2 by Kenneth Kalmer. For Rails 3 the need for this functionality was reduced dramatically due to the introduction of ActiveModel. But because the ActiveModel does not support relations and nested attributes the existence of this gem is still justified.
This gem is a Rails 5+ compatible update, and renaming of that gem.
For a history of technical implementation details feel free to take a look in the git log :-)
This library aims to adhere to Semantic Versioning 2.0.0. Violations of this scheme should be reported as bugs. Specifically, if a minor or patch version is released that breaks backward compatibility, a new version should be immediately released that restores compatibility. Breaking changes to the public API will only be introduced with new major versions.
As a result of this policy, you can (and should) specify a dependency on this gem using the Pessimistic Version Constraint with two digits of precision.
spec.add_dependency 'activerecord-tablefree', '~> 3.0'
- Copyright (c) 2008 - 2009 Kenneth Kalmer
- Copyright (c) 2012 - 2017 Jarl Friis
- Copyright (c) 2017 - 2018 Peter H. Boling of Rails Bling
The license is MIT. See LICENSE.txt for further details.