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While installing the data_mapper gem, I got the following message:

Fetching: dm-validations-1.2.0.gem (100%)
Successfully installed dm-validations-1.2.0
Fetching: bcrypt-3.1.7.gem (100%)
Building native extensions.  This could take a while...
Successfully installed bcrypt-3.1.7
Fetching: bcrypt-ruby-3.1.5.gem (100%)

#######################################################

The bcrypt-ruby gem has changed its name to just bcrypt.  Instead of
installing `bcrypt-ruby`, you should install `bcrypt`.  Please update your
dependencies accordingly.

#######################################################

Successfully installed bcrypt-ruby-3.1.5

Maybe something to look into.

Per Relationship#child_key, the default implementation is:

property_name ||= "#{parent_name}_#{parent_property.name}".to_sym

This suggests that given a Post that belongs to an Author, the inferred child_key on the:

class Post
  belongs_to :author, :model => 'User'
end

declaration would be author_id, and not post_id as shown on the associations docs page here.

The very simple fix for this is available at http://github.com/vandrijevik/datamapper.github.com/commit/a1aa49f080f900470cd8b8546fdc6dfe30aa7660

Looks like DNS configuration needs to be updated:

Legacy IP Deprecation Notice

Configuring an A record

Im trying to do a bulk update maybe about 30000 records , there should be a feature for a bulk update. Now it takes like 5 minutes.

A standard Rails 3.1.x app will include this in the Gemfile:

group :assets do
  gem 'sass-rails',   '~> 3.1.5'
  gem 'coffee-rails', '~> 3.1.1'
  gem 'uglifier', '>= 1.0.3'
end

gem 'jquery-rails'

group :test do
  # Pretty printed test output
  gem 'turn', '~> 0.8.3', :require => false
end

However, rails new project_name -m http://datamapper.org/templates/rails.rb doesn't preserve any of this, which makes the new app broken since any requests to /assets/* will fail.

Im trying to do a bulk update maybe about 30000 records , there should be a feature for a bulk update. Now it takes like 5 minutes.

I often find myself doing Google searches with "site:datamapper.org" - perhaps a field for such a custom search might be a useful addition to the site?

As reported in datamapper/dm-rails#34 (comment) the templates need to remove two ActiveRecord related configuration options in config/development.rb for Rails 3.2.X:

# Raise exception on mass assignment protection for Active Record models
# config.active_record.mass_assignment_sanitizer = :strict

# Log the query plan for queries taking more than this (works
# with SQLite, MySQL, and PostgreSQL)
# config.active_record.auto_explain_threshold_in_seconds = 0.5

Another issue is that the Gemfile currently requires an older version of Rails: 3.1.3 and not 3.2.1. This change would require an update of the dependencies of dm-rails and dm-active_model to 1.2.1

Most people are still using Rails 2, and will be for awhile. Write a comparison/how-to on moving from AR to DM, or simply so people can understand how to do what was done in AR in DM.

Please comment with any talks/presentations. When we have a couple we'll add the page to dm.org.

The list of Community Plugins should be easily found on datamapper.org. We could either add a link to the Community page or make a new page for Community Plugins.

I remember switching from AR because of certain pain points, things solved by DM.

Properties in the model (so you don't have to keep checking the schema in the DB)
Better associations (through many, more than 1 step away)
Composite primary keys

Please comment with your pain points solved by DM.

Using the logs from this channel we should be able to create better tutorials and documentation.

We'd like to create a survey for new users of DataMapper to assess where we might improve documentation, and possibly, DataMapper itself. Comments with suggested questions are welcome.