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我是Rails的初學者。在下面的代碼中,有一個設置爲false的ID。它的含義是什麼?Rails create_table查詢
class CreateCoursesStudents < ActiveRecord::Migration
def self.up
create_table :courses_students, **:id => false** do |t|
t.integer :course_id,:null => false
t.integer :student_id, :null => false
end
# Add index to speed up looking up the connection, and ensure # we only
enrol a student into each course once
add_index :courses_students, [:course_id, :student_id], :unique => true
end
def self.down
remove_index :courses_students, :column => [:course_id, :student_id]
drop_table :courses_students
end
end
感謝
謝謝:)和create_table行中的id => false語句有什麼關係? – felix 2010-04-27 20:36:43