max

Summary

In Sails.js, use the max validation rule to enforce a maximum value for attributes with the number data type. Combined with the min rule, you can define a valid range for values.

For example, setting min: 18 and max: 120 ensures the age attribute only accepts values between 18 and 120 (inclusive). This prevents invalid inputs like 2 or 2000 while allowing valid values within the specified range.

Transcript

Now that we’ve set a minimum value for the age attribute, let’s explore how to set a maximum value. In the previous lesson, we ensured age must be at least 18. However, without a maximum, users could input unrealistic values like 2000.

To fix this, add the max validation rule:

 age: {  
  type: 'number',  
  defaultsTo: 18,  
  min: 18,  
  max: 120  
}  

This ensures age must be between 18 and 120 (inclusive).

Testing the Validation:

1. Invalid Input (Below Minimum):

   await User.create({ age: 2 });  

   Error: "Value 2 was less than the configured minimum (18)."

2. Invalid Input (Above Maximum):

   await User.create({ age: 2000 });  

   Error: "Value 2000 was greater than the configured maximum (120)."

3. Valid Input (Within Range):

   await User.create({ age: 120 });  
   await User.create({ age: 50 });  

   Result: Records are created successfully.

Key Takeaways:

• Use max to enforce a maximum value for number attributes.

• Combine min and max to define a valid range for values.

• This ensures data integrity by preventing unrealistic or invalid inputs.