quantity property
quantity The quantity of the related product in this product - Numerator is the quantity of the related product. Denominator is the quantity of the present product. For example a value of 20 means that this product contains 20 units of the related product; a value of 1:20 means the inverse - that the contained product contains 20 units of the present product.
Implementation
Ratio get quantity => throw _privateConstructorUsedError;