primary_key()
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Defines the primary key field — can be overridden in subclasses. Overwriting will negate any effect of the primary_key_prefix_type setting, though.
# File lib/active_record/attribute_methods/primary_key.rb, line 48 48: def primary_key 49: @primary_key = reset_primary_key unless defined? @primary_key 50: @primary_key 51: end