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https://jira.jboss.org/jira/browse/RF-7849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12485277#action_12485277
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Nick Belaevski commented on RF-7849:
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1. Working demo involving serializable data model + rich:datscroller:
http://livedemo.exadel.com/richfaces-demo/richfaces/dataTable.jsf?tab=dataModel&cid=4830393
ModifiableDataModel uses in-memory sorting, that's why range is indefinite in
this case - it's unknown how many rows it would need to fetch from data source
in order to fill the data window for the particular filtering conditions. Check
this:
http://livedemo.exadel.com/richfaces-demo/richfaces/dataTable.jsf?tab=modifiableDataModel&cid=4830656
for model that does sorting and filtering just in DB
2. Yes, rich:datascroller relies on the #getRowCount() method to know how many
rows are there - your model should return correct result. Please take a look at
UIData#getRowCount():
/**
* <p>Return the number of rows in the underlying data model. If the number
* of available rows is unknown, return -1.</p>
*
* @throws FacesException if an error occurs getting the row count
*/
public int getRowCount() {
return (getDataModel().getRowCount());
}
> datascroller does not calculate its page count correctly when used with
> dataTable & with SerializableDataModel...
> -----------------------------------------------------------------------------------------------------------------
>
> Key: RF-7849
> URL: https://jira.jboss.org/jira/browse/RF-7849
> Project: RichFaces
> Issue Type: Bug
> Components: component-tables
> Affects Versions: 3.3.1
> Environment: Windows XP; Richfaces 3.3.1.GA; MyFaces 1.2.6, facelets
> 1.1.14. Project base generated with appfuse v2
> Reporter: Jérôme JADOULLE
>
> ... or so it seems.
> As others, I am faced with the need to implement a server-side pagination so
> that only a subset of my data gets fetched from my backend (a Hibernate 3
> "managed" database).
> I have read the examples explaining how to do this (see the links below) and
> tried to make them run but I encounter 2 main errors when testing:
> first, when implementing the walk method in the SerializableDataModel, the
> range parameter always returns 0 as its first row and -1 as the quantity.
> When investigating in the source code, I found out that my walk method is in
> fact called by the "modify" method of the "ModifiableModel" class.
> Fact is that, the "range" parameter passed to the walk method is always
> created like this: "new SequenceRange(0, -1)", already meaning that, whatever
> happens, the values used in the range will be 0 and -1.
> Second point appears when I force the quantity of rows to a predefined value
> other than -1 (to see if the rest of the system works fine). When doing
> this, the 20 first columns correctly get displayed in my table but, even if
> the getRowCount() method is correctly implemented as well (returning the
> total quantity of rows in my db), the datascroller uses the
> UIData.getRowCount() method to calculate the quantity of rows it totally
> contains (in order to know how to display itself) and this only returns the
> quantity of items actually present in an ArrayList used to store the rows to
> display.
> Meaning that, whatever the quantity of rows present in my system,
> datascroller always thinks that the size is 20 (in this case).
> Don't know if I am clear enough. If not, i'll post more information.
> Links followed to understand how to implement the datamodel:
> http://gochev.blogspot.com/2009/08/richfaces-server-side-paging-with.html
> http://eclecticprogrammer.com/2008/06/25/sorting-and-paginating-in-the-database-with-richfaces/
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