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If you are getting this when running rails migrations using a postgresql adapter:

Input string is longer than NAMEDATALEN-1 (63)

Then this tiny plugin can solve this problem. Index names longer than 63 characters work fine with some postgresql adapters and not others. I’m not sure why. This adds a method to ActiveRecord::ConnectionAdapters::PostgreSQLAdapter that keeps the index_names under the limit.

here’s the entire piece of code:

ActiveRecord::ConnectionAdapters::PostgreSQLAdapter.class_eval do
  #There are PostgreSQL drivers/versions of drivers that truncate
  #index names to 63 characters. Since some do not, this override makes
  #sure that the truncate occurs regardless of PostgreSQL driver.
  def index_name(table, columns)
    super(table, columns)[0..62]
  end
end

To install this plugin using ext, you can use:

ext install git://github.com/azimux/ax_fix_long_psql_index_names.git

or, using rake plugin:

./script/plugin install git://github.com/azimux/ax_fix_long_psql_index_names.git