column-modifiers.md

Column Modifiers

When creating a column from the Blueprint object, a Column object is returned. This column gives you access to a few modifier commands to further configure the column.

Methods
comment	default
nullable	primaryKey
references	unsigned
unique

comment

Attach a comment to the column.

Argument	Type	Required	Default	Description
comment	string	true		The comment text.

Example:

SchemaBuilder

schema.create( "users", function( table ) {
    table.integer( "age" ).comment( "Do not lie about your age" );
} );

SQL (MySQL)

CREATE TABLE `users` (
    `age` INTEGER NOT NULL COMMENT `Do not lie about your age`
)

default

Sets a default value for the column.

Argument	Type	Required	Default	Description
value	string	true		The default value.

Example:

SchemaBuilder

schema.create( "users", function( table ) {
    table.boolean( "is_active" ).default( 1 );
} );

SQL (MySQL)

CREATE TABLE `users` (
    `is_active` TINYINT(1) DEFAULT 1
)

nullable

Sets the column to allow null values.

Argument	Type	Required	Default	Description
No arguments

All columns are created as NOT NULL by default. As such, there is no notNull method.

Example:

SchemaBuilder

schema.create( "users", function( table ) {
    table.timestamp( "last_logged_in" ).nullable()
} );

SQL (MySQL)

CREATE TABLE `users` (
    `last_logged_in` TIMESTAMP
)

primaryKey

Adds the column as a primary key for the table.

Argument	Type	Required	Default	Description
indexName	string	false	A derived name built from the table name and column name.	The name to use for the primary key constraint.

The primaryKey method returns a TableIndex instance. Additional methods can be chained off of it.

Example:

SchemaBuilder

schema.create( "users", function( table ) {
    table.uuid( "id" ).primaryKey();
} );

SQL (MySQL)

CREATE TABLE `users` (
    `id` CHAR(35) NOT NULL,
    CONSTAINT `pk_users_id` PRIMARY KEY (`id`)
)

references

Creates a foreign key constraint for the column.

Argument	Type	Required	Default	Description
value	string	true		The default value.

IMPORTANT: Additional configuration of the foreign constraint is done by calling methods on the returned TableIndex instance.

Example:

SchemaBuilder

schema.create( "users", function( table ) {
    table.unsignedInteger( "country_id" ).references( "id" ).onTable( "countries" ).onDelete( "cascade" );
} );

SQL (MySQL)

CREATE TABLE `users` (
    `country_id` INTEGER UNSIGNED NOT NULL,
    CONSTRAINT `fk_users_country_id` FOREIGN KEY (`country_id`) REFERENCES `countries` (`id`) ON UPDATE NO ACTION ON DELETE CASCADE
)

unsigned

Sets the column as unsigned.

Argument	Type	Required	Default	Description
No arguments

Example:

SchemaBuilder

schema.create( "users", function( table ) {
    table.integer( age" ).unsigned();
} );

SQL (MySQL)

CREATE TABLE `users` (
    `age` INTEGER UNSIGNED NOT NULL
)

unique

Sets the column to have the UNIQUE constraint.

Argument	Type	Required	Default	Description
No arguments

Example:

SchemaBuilder

schema.create( "email", function( table ) {
    table.string( email" ).unique();
} );

SQL (MySQL)

CREATE TABLE `users` (
    `email` VARCHAR(255) NOT NULL UNIQUE
)