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(Quick Reference) # id ## Purpose Customizes the way the identifier for a domain class is generated ## Examples
    class Book {
        static mapping = {
            id generator: 'hilo',
               params: [table: 'hi_value', column: 'next_value', max_lo: 100]
        }
    }
## Description Usage: `id(map)` Arguments: `generator` (optional) - The name of the generator to use. Can be `increment`, `identity`, `sequence`, `hilo`, `seqhilo`, `uuid`, `guid`, `native`, `assigned`, `select`, `foreign` or `sequence-identity`. See Hibernate reference documentation for more information. `composite` (optional) - Takes a list of property names to use that form the composite identifier `name` (optional) - The property name to use as the identifier `params` (optional) - Any parameters to pass to the defined identity generator `column` (optional) - The column name to map the identifier to. The remaining column definition properties are also available. By default GORM uses the native strategy to generate a database identifier for each entity (typically an auto-incrementing column or a sequence). You can alter this with the `id` methods `generator` argument:
    static mapping = {
        id generator: 'hilo',
           params: [table: 'hi_value', column: 'next_value', max_lo: 100]
    }
You can also use the method to define a composite identifier:
    static mapping = {
        id composite: ['title', 'author']
    }
or change the name of the property that defines the identifier:
    static mapping = {
        id name: 'title'
    }
You can also alter the column definition:
    static mapping = {
        id column: 'book_id', type: 'integer'
    }
See the section on Custom Database Identity in the user guide for more information. | Quick Reference (hide)