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Add a note about ensuring the version is right for the adapter (since…

… you might well have specified the right gem, but locked it to too low of a version)
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1 parent 094e31c commit 660523123103e904622a135940a1c12ad9256629 @dhh dhh committed Oct 27, 2013
@@ -55,7 +55,7 @@ def resolve_hash_connection(spec) # :nodoc:
begin
require path_to_adapter
rescue Gem::LoadError => e
- raise Gem::LoadError, "Specified '#{spec[:adapter]}' for database adapter, but the gem is not loaded. Add `gem '#{e.name}'` to your Gemfile."
+ raise Gem::LoadError, "Specified '#{spec[:adapter]}' for database adapter, but the gem is not loaded. Add `gem '#{e.name}'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord)."
rescue LoadError => e
raise LoadError, "Could not load '#{path_to_adapter}'. Make sure that the adapter in config/database.yml is valid. If you use an adapter other than 'mysql', 'mysql2', 'postgresql' or 'sqlite3' add the necessary adapter gem to the Gemfile.", e.backtrace
end

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