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| t.string :name | ||
| t.string :roll_number | ||
| t.string :branch | ||
| t.decimal :cgpa, precision: 4, scale: 2 |
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Precision - Number of digits.
Scale - Number of digits after the decimal point.
Since CGPA has two digits after the decimal point and lies between 0 and 10, it will have scale of 2 and precison of 4.
But precision of 4 implies that 12.34 is valid CGPA, after it has 4 digits (precision) and 2 digits after decimal (scale).
Therefore, I have added a validation in app/models/student.rb to limit CGPA between 0 and 10.
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The second session was more straightforward than the first two, as it built directly upon the concepts explained.