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-rw-r--r--railties/lib/rails/generators/rails/app/templates/config/environments/development.rb.tt4
-rw-r--r--railties/lib/rails/generators/rails/app/templates/config/environments/production.rb.tt6
2 files changed, 10 insertions, 0 deletions
diff --git a/railties/lib/rails/generators/rails/app/templates/config/environments/development.rb.tt b/railties/lib/rails/generators/rails/app/templates/config/environments/development.rb.tt
index 47078e3af9..beaf941282 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/environments/development.rb.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/environments/development.rb.tt
@@ -25,6 +25,10 @@
<%- unless options.skip_active_record? -%>
# Raise exception on mass assignment protection for ActiveRecord 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
<%- end -%>
# Do not compress assets
diff --git a/railties/lib/rails/generators/rails/app/templates/config/environments/production.rb.tt b/railties/lib/rails/generators/rails/app/templates/config/environments/production.rb.tt
index 50f2df3d35..40ec3fc644 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/environments/production.rb.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/environments/production.rb.tt
@@ -60,4 +60,10 @@
# Send deprecation notices to registered listeners
config.active_support.deprecation = :notify
+
+ <%- unless options.skip_active_record? -%>
+ # 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
+ <%- end -%>
end