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-rw-r--r--activerecord/lib/active_record/migration/command_recorder.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/migration/command_recorder.rb b/activerecord/lib/active_record/migration/command_recorder.rb
index b52e89d792..ab5a4cad89 100644
--- a/activerecord/lib/active_record/migration/command_recorder.rb
+++ b/activerecord/lib/active_record/migration/command_recorder.rb
@@ -69,7 +69,7 @@ module ActiveRecord
# invert the +command+.
def inverse_of(command, args, &block)
method = :"invert_#{command}"
- raise IrreversibleMigration unless respond_to?(method, true)
+ raise IrreversibleMigration, "#{method} is not defined, so #{command} is not reversible" unless respond_to?(method, true)
send(method, args, &block)
end