toString method
A string representation of this object.
Some classes have a default textual representation,
often paired with a static parse function (like int.parse).
These classes will provide the textual representation as
their string representation.
Other classes have no meaningful textual representation
that a program will care about.
Such classes will typically override toString to provide
useful information when inspecting the object,
mainly for debugging or logging.
Implementation
@override
String toString() => 'Coupon[id=$id, code=$code, discountType=$discountType, description=$description, lessonDiscount=$lessonDiscount, applyStudent=$applyStudent, applyTutor=$applyTutor, startAt=$startAt, endAt=$endAt, originalUnitPriceInCents=$originalUnitPriceInCents, presentUnitPriceInCents=$presentUnitPriceInCents, originalAmountInCents=$originalAmountInCents, presentAmountInCents=$presentAmountInCents, eligibleMinBookingNumber=$eligibleMinBookingNumber]';