method
references
v4.2.7 -
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- Class:
ActiveRecord::ConnectionAdapters::Table
references(*args)public
Adds a reference.
t.references(:user) t.belongs_to(:supplier, foreign_key: true)
See SchemaStatements#add_reference for details of the options you can use.
2Notes
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
add index directly
You can add an index now directly on the foreign_key :
t.references(:user, index: true)
