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POgrails GORM: how to access id of super class
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copied!<p>I inherited a Grails 1.3.9 project that I need to maintain.</p> <p>There is a situation when one of the controllers needs to be extended to log creations of extended appointments.</p> <p>The appointments are defined like this:</p> <pre><code>class Appointment implements Serializable{ static mapping = { table 'appointment' version false tablePerHierarchy false id generator:'sequence', params:[sequence:'seq_te_id'] cache true columns{ id column:'te_id' start column: 'te_start' // Other columns follow } } } </code></pre> <p>Special appointment:</p> <pre><code>class SpecialAppointment extends Appointment implements Serializable { static mapping = { table 'special_appointment' cache true columns{ id column: 'pt_id' comment column: 'pt_name' // other columns } } } </code></pre> <p>History log:</p> <pre><code>class AppointmentHistory { static mapping = { version false table 'appointment_history' id generator: 'sequence', params:[sequence:'seq_th_id'] cache true columns { id column: 'th_id' termin column: 'pt_id' // other columns } } } </code></pre> <p>In the controller to create SpecialAppointment, which has Appointment as its base class, I need to create and save new instance of AppointmentHistory, which has a relation to Appointment.</p> <pre><code>def app = new SpecialAppointment() // set fields here app.save(flush:true) // save history log def history = new AppointmentHistory(appointment: app) </code></pre> <p>I passed instance of SpecialAppointment when creating history object, but it is wrong, because it uses its ID, instead of ID of Appointment.</p> <p>Unfortunately I was not able to figure out <strong>proper syntax</strong> to access members of super class from just saved instance of derived class.</p> <p>Please advise.</p>

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