Sequelize ORM with NodeJS #10 Validations & Constraints

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In Sequelize ORM, you can enforce data validation and constraints on your database models to ensure that the data stored in your database meets certain requirements and adheres to specific rules. Validations and constraints help maintain data integrity and prevent incorrect or invalid data from being inserted into your database. Here's how to use validations and constraints in Sequelize:


Validations:

Validations are rules that specify what values are allowed for specific model attributes. Sequelize provides a variety of built-in validators that you can use to enforce data integrity. Here are some common validators:

allowNull: Ensures that the attribute is not null.
notEmpty: Ensures that the attribute is not an empty string.
isEmail: Validates that the attribute is a valid email address.
isNumeric: Validates that the attribute is a numeric value.
len: Validates the length of a string attribute.
isIn: Validates that the attribute's value is within a predefined list of values.
isDate: Validates that the attribute is a valid date.


Constraints:

Constraints are rules that are enforced at the database level to maintain data integrity. Sequelize allows you to define constraints when defining your model, and these constraints are translated into the appropriate database-specific constraints when generating the database schema. Some common constraints include:

primaryKey: Specifies that an attribute is the primary key.
unique: Enforces uniqueness for an attribute.
references and onUpdate/onDelete: Defines foreign key constraints to ensure referential integrity between tables.







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