Grails Amazon S3 0.7.4 Released

see http://refactor.com.au/blog/grails-amazon-s3-074-released

Grails WebTest Plugin 1.2.0 Released

See http://refactor.com.au/blog/grails-webtest-plugin-120-released

Grails Amazon S3 Plugin 0.6.3 released

See http://refactor.com.au/blog/grails-amazon-s3-plugin-063-released

Adding pagination to a Grails WebFlow state

I noticed a few unanswered questions relating to paginating a WebFlow state on the users mailing list and thought I'd post the solution I came up with for a Refactor project I was working on last week.

It basically involves splitting the behaviour into an action and a view state with a transition between them called 'paginate'

loadResults {
 action {
    def criteria = MyDomain.createCriteria(){
        eq('someField','someval')
    }
    flow.myDomainResults  = criteria.list([max: 9, offset: flow.myDomainOffset ?: 0])   
    flow.totalMyDomains = flow.myDomainResults.totalCount
    return success()
 }
 on('success').to('browse')
 on(Exception).to "handleError"
}
browse {
 on('paginate') {
    flow.myDomainOffset = params.offset
 }.to('loadResults')
 on('selectItem').to('someOtherState')
 //...
}

One point to note is that I use a criteria in order to get the totalCount property populated for me automatically so that I don't have to run a separate query. Also, the above only works if your domain class is Serializable, in my real application this wasn't the case so I stored a list of maps containing the properties I wanted to display instead of the list of domain objects.

Then in the view all we need to do is to pass the current page from the flow scope to the paginate tag. The paginate tag also contains an extra parameter in order to trigger the paginate event when the generated links are clicked.

<g:each in="${myDomainResults}" status="i" var="myDomain">
    <g:form action="myFlow">
        <input name="id" value="${myDomain.id}" type="hidden">
        URL: ${myDomain.url}
        <g:submitbutton name="selectItem" value="Select"/>
    </g:form>
</g:each>
<div class="paginateButtons">
   <g:paginate max="9" offset="${myDomainOffset}" total="${totalMyDomains}" params="${[_eventId_paginate:true]}" />
</div>

You can also see I render each item as a separate form with a hidden id field and a submit button to trigger the 'selectItem' event and move onto the next state.

I haven't tried messing with all the options for g:paginate to make sure they still work so please let me know if you find any problems with the above code.

Grails Amazon S3 Plugin 0.6 Released

Check out the Refactor blog for the details.

Grails JSR-186 Portlets Plugin Released

Kenji Nakamura has taken the reins of my initial work on the Grails Portlets plugin and done an awesome job of refactoring it into more manageable sub-plugins.

You can now plug-in portal implementations with Pluto and Liferay supported initially.

JSR-286 will be supported when the underlying version of Spring used by Grails is updated to Spring 3.0.

Check it out at the Grails plugin portal.

Great work Kenji!

Grails Amazon S3 Plugin 0.5 Released

The latest version of the Amazon S3 plugin has been released which incorporates the latest jets3t snapshot library (0.7.1-SNAPSHOT) which has improved compatibility with the Eucalyptus open source EC2/S3 clone and some bug fixes.

The plugin S3 event handling code was also updated to avoid stale object and optimistic locking exceptions being thrown by Hibernate.