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Improve documentation for :foreign_key option in migrations #38469

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Improve documentation for :foreign_key option in migrations #38469

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2 changes: 2 additions & 0 deletions activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
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Expand Up @@ -894,6 +894,8 @@ def index_name_exists?(table_name, index_name)
# See #add_index for usage of this option.
# [<tt>:foreign_key</tt>]
# Add an appropriate foreign key constraint. Defaults to false.
# If the association name doesn't correspond to the joined table name,
# specify Hash with <tt>to_table:</tt> key points to that table name.
# [<tt>:polymorphic</tt>]
# Whether an additional +_type+ column should be added. Defaults to false.
# [<tt>:null</tt>]
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