How to count ocurrences in 1 to many relationship in gorm - grails

Posted by xain on Stack Overflow See other posts from Stack Overflow or by xain
Published on 2010-04-24T19:43:57Z Indexed on 2010/04/25 3:33 UTC
Read the original article Hit count: 246

Filed under:

grails

|

gorm

|

domain

Hi, I have 2 domain classes

class A {
  ....
  static hasMany = [bs:B]
}
class B {
  int code
  ....
}

How can I list the number of ocurrences of all codes in B in all the A table?

Something like

b.each { thisb ->
  int ocurrences = A.bs.findAll{it == thisb}.size()
  ...
}

Thanks

© Stack Overflow or respective owner

Related posts about grails

Grails, app-engine, jpa - beginner having trouble with grails generate-all

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to learn about grails with Google App Engine and JPA by following a few tutorials: http://www.morkeleb.com/2009/08/12/grails-and-google-appengine-beginners-guide/ http://inhouse32.appspot.com/index.html http://grails.org/plugin/app-engine I've got grails 1.3.0 RC 2, and App Engine SDK… >>> More
Grails Warnings/Errors during run-app

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm currently seeing the warnings below when trying to run my Google App Engine/Grails test app in Eclipse. Warning, target causing name overwriting of name startLogging Warning: C:\Users\Some Person.grails\1.2.0\projects\test-grails\plugins\app-engine-0.8.8\grails-app\conf\spring not found. Warning:… >>> More
Grails, app-engine, jpa - TargetInvocationException

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to learn about grails with Google App Engine and JPA by following a few tutorials: http://www.morkeleb.com/2009/08/12/grails-and-google-appengine-beginners-guide/ http://inhouse32.appspot.com/index.html http://grails.org/plugin/app-engine I've got grails 1.3.0 RC 2, and App Engine SDK… >>> More
Inject log object in Grails class outside of grails-app

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a class in src/groovy in my grails project. How do i make a log field that gets injected with the correct logger for that class ? Is there a commons logging or just log4j in grails ? >>> More
grails run-war connects to mysql but grails run-war doesn't

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I have a unexpected problem. I had create a war with grails war. Then I had deployed in Tomcat. For my surprise the crud works fine but I don't know what persistence is using. So I did this test: Compare grails prod run-app with grails prod run-war. The first works fine, and does conect with… >>> More

Related posts about gorm

accessing associations within GORM Events

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, My Grails app has a User class and a Role class. The User class has an authorities property which holds the roles assigned to that user, e.g. class User { static hasMany = [authorities: Role] // This method is called automatically after a user is inserted def afterInsert() { … >>> More
Grails GORM (Hibernate) query

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, I'm trying to do the below sql statement in GORM select * from table1 where table1.x not in (select x from table 2 where y='something'); so, I have two tables, and needs to find the entries from table 1 which are not in table 2. In Grails def xx= table2.findByY('something') … >>> More
Gorm findallby date tip

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, any quick tip to implement findAllByGreaterThan so I can filter those records which date field is today (from 00:00 up to present). Thanks in advance >>> More
Gorm findAllBy inside gsp doubt

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, can anybody tell me why this works <g:each var="n" in="${com.pp.News.list()}"> <h2>${n.t}</h2> <p>${n.tx}</p> </g:each> but this doesn't ? <g:set var="news" value="${com.pp.News.findAllByShow(true,[sort:'prio', order:'desc',max:5])}" /> <g:each… >>> More
Result set mapping in Grails / GORM

as seen on Stack Overflow - Search for 'Stack Overflow'
I want to map the result of a native SQL query to a simple bean in grails, similar to what the @SqlResultSetMapping annotation does. For example, given a query select x.foo, y.bar, z.baz from //etc... map the result to class FooBarBaz { String foo String bar String baz } Can anyone provide… >>> More