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Rails plugin that provides basic private messaging functionality between the users of a site.
Latest commit 7ba7d3c @safarista safarista Merge pull request #27 from dimitrid/master
added eager loading of Users


Simple Private Messages

Now Rails 3 compatible!

For Rails 2.3.x users there is an appropriately named branch that can be used.

This plugin provides basic private messaging functionality between the users of a site. It's not big on features but the idea is that it's nice and simple and light on resources.

It's not bound to specific model names and plays nice with will_paginate.


Since there is no .gemspec for this, you must specify '0.0.0' as version in your Gemfile to make it install properly:

gem 'simple-private-messages', '0.0.0', :git => 'git://'

Then run

bundle install

First create the private message model by running the simple_private_messages:model generator, passing two parameters - the name you want to use for the Message model and the name of the User model.

For all examples in the readme, we will use Message and User.

rails generate simple_private_messages:model User Message

Now add the following entry to the model which will have the messages


If you have used anything other than “Message”, you will have to pass the correct class name along as :class_name.

That's it.


Examples assume you're using Restful Authentication or AAA, with a user model of User and message model of Message.

Creating / sending a message:

frank = User.find_by_login("frank")
george = User.find_by_login("george")

message =
message.subject = "Happy Festivus, son"
message.body = "It's time for the Feats of Strength."
message.sender = frank
message.recipient = george

Reading a message

message = Message.read_message(id, user)

Returns the message of the chosen id and ensures the passed user is either the sender or the recipient. If unread, it checks to see if the passed user is the recipient and if so marks the read_at timestamp.

You can also check if a message has been read with the following:


Retrieving a user's received mail

newman = User.find_by_login("newman")

The following will return Newman's number of unread messages:


Or the following for true or false on whether there are unread messages:


Retrieving a user's sent mail

newman = User.find_by_login("newman")

Custom finds

                        :conditions => ["read_at < ?", 2.days.ago],
                        :limit => 20,
                        :order => "created_at ASC")

Deleting a message

newman = User.find_by_login("newman")
message = newman.received_messages.find(3)

This will look at a message and mark it read by the sender or recipient, based on whichever Newman is. It now will no longer appear in Newman's messages.

kramer = User.find_by_login("kramer")
message = kramer.sent_messages.find(3)

Now that both sender and recipient have marked the message deleted, it gets destroyed. Should a message be sent to oneself, it will be deleted in one step due to the sender and recipient being the same.


A generator is included to create a basic controller and set of views.

Run the simple_private_messages:scaffold generator with the same options as before:

rails generate simple_private_messages:scaffold User Message

The controller will be named with the pluralised version of the model name.

Then uncomment the entry at the top of the message model to establish the :to accessor.

You should now have working messaging.


In spec/spec_helper.rb add

require 'simple-private-messages/matchers'


config.include Professionalnerd::SimplePrivateMessages::Shoulda::Matchers

In user model spec file:

it { should have_private_messages }

and message model spec file:

it { should be_private_message }


Unit tests are provided for the model extensions but not for the generated scaffold. Running these requires sqlite3.


Testing functionality for creating dedicated models / loading of a custom schema taken from acts_as_taggable_on_steroids.

Thank you to nerdinand for the Rails 3 upgrade.


Copyright © 2007 Jon Gilbraith released under the MIT license

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