Grails- How to display the last uploaded image? - grails

Question

I used to displayed more than one picture, hence I used the each. Now I have to display only the last uploaded picture. How should I changed my code?
<g:each in ="${statusMessage?.fetchProductPictureUrls() }" var="picture">
<div class="feed-picture">
<div class="fl">
<img class="single" src="${picture }" alt="Product Picture">
</div>
</div>
</g:each>

Answer 1

You can do this by many ways, here are 2:
1 - Filter the desired image in your controller, service or presenter and in your .gsp you just need to access your image variable.
2 - Use a tagLib to do this (not tested):
class LastImageTagLib {
static namespace = "last"
def image = { attr ->
//filter your image
def lastImage = attr.images.last()
out << "<img class='single' src='${lastImage}' alt='Product Picture'>"
}
}
And in your .gsp:
<div class="feed-picture">
<div class="fl">
<last:image images="${statusMessage?.fetchProductPictureUrls()}" />
</div>
</div>
I think the first option is better.

Answer 2

So going on the code above I am unsure if the list "fetchProductPicturesUrls" is sorted or not.
If it is, you have a few options.
You can grab the last entry of the list by leveraging the .last() method.
http://groovy.codehaus.org/groovy-jdk/java/util/List.html
OR
You can grab the list size and track the count by setting the status flag in your foreach loop.
http://grails.org/doc/latest/ref/Tags/each.html
Suggestion:
I would recommend storing images on disk or in the cloud vs storing them in the database.
A nice way to maintain these images is to create a domain. Here is a sample I use for S3 images.
class S3Image {
Date dateCreated
Date lastUpdated
String imageUrl
String imageName
static constraints = {
imageUrl(blank:false)
imageName(blank:false)
}
}