references(*args) public

Adds a reference. Optionally adds a type column. references and belongs_to are acceptable.

 t.references(:goat, :polymorphic => true)
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August 22, 2008
4 thanks

Doesn't add an index

Typically you will want to have an index on foreign keys but this method doesn’t assume that. Outside of the create_table block you should follow this with add_index :

add_index :table_name, :goat_id
# and, if polymorphic:
add_index :table_name, :goat_type
April 23, 2015
0 thanks

add index directly

You can add an index now directly on the foreign_key :

t.references(:user, index: true)