So (apologies to Fred) this may be deeper than I thought: How does a
HABTM table EVER get updated? From the Rails 1.9.1
active_record/base.rb sources, update_attributes => save =>
create_or_update => update. The sources for update():
# Updates the associated record with values matching those of the
instance attributes.
# Returns the number of affected rows.
def update(attribute_names = @attributes.keys)
quoted_attributes = attributes_with_quotes(false, false,
attribute_names)
return 0 if quoted_attributes.empty?
connection.update(
"UPDATE #{self.class.quoted_table_name} " +
"SET #{quoted_comma_pair_list(connection, quoted_attributes)}
" +
"WHERE #{connection.quote_column_name(self.class.primary_key)}
= #{quote_value(id)}",
"#{self.class.name} Update"
)
end
Sure enough, it appears to depend on some sort of 'id' -- what is the
primary_key column name for HABTM tables? Or am off in the weeds?
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