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-rw-r--r--activerecord/lib/active_record/relation.rb14
1 files changed, 13 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/relation.rb b/activerecord/lib/active_record/relation.rb
index 80b85ce498..6f2248fa21 100644
--- a/activerecord/lib/active_record/relation.rb
+++ b/activerecord/lib/active_record/relation.rb
@@ -1,5 +1,6 @@
# -*- coding: utf-8 -*-
require 'active_support/core_ext/object/blank'
+require 'active_support/deprecation'
module ActiveRecord
# = Active Record Relation
@@ -521,7 +522,18 @@ module ActiveRecord
# always convert table names to downcase as in Oracle quoted table names are in uppercase
joined_tables = joined_tables.flatten.compact.map { |t| t.downcase }.uniq
- (tables_in_string(to_sql) - joined_tables).any?
+ referenced_tables = (tables_in_string(to_sql) - joined_tables)
+ if referenced_tables.any?
+ ActiveSupport::Deprecation.warn(
+ "Your query appears to reference tables (#{referenced_tables.join(', ')}) that are not " \
+ "explicitly joined. This implicit joining is deprecated, so you must explicitly " \
+ "reference the tables. For example, instead of Author.includes(:posts).where(\"posts.name = 'foo'\"), " \
+ "you should write Author.eager_load(:posts).where(\"posts.name = 'foo'\")."
+ )
+ true
+ else
+ false
+ end
end
def tables_in_string(string)