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I'm using views data export module to output results as csv, xls, xml and txt files
I'm using Batched export (with Segment size 100) because there are many results.
I have some fields which I want to alter their values.
I have implemented hook_views_pre_render to replace field values with ones I'm getting from webservice.
The problem that some values are correctly changed, others not
Is there a solution for that?
Instead of a pre-render function, I think the correct spot to modify values is actually hook_views_post_execute(). This is invoked after the query has run, but before the data has been passed to rendering.
Adding output to the view can be accomplished by placing text on $view->attachment_before and $view->attachment_after. Altering the content can be achieved by editing the items of $view->result.
It has been a while since I've personally played with Views Data Export so I'm not 100% sure why you're seeing only some values change and not others, but I recall the rendering of the export being a little abnormal compared to the usual render process.
