我有一个这样的分页助手：
def paginate(collection)
count = collection.count
collection.offset(@offset).limit(@per_page)
end
for collection我只想选择某些字段，但如果我选择了count，则Model.all.select(:foo, :bar)的行为会发生变化。有没有办法可以通过，例如collection package com.hmkcode;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.tool.xml.XMLWorkerHelper;
public class App
{
public static void main( String[] args ) throws DocumentException, IOException
{
// step 1
Document document = new Document();
// step 2
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("pdf.pdf"));
// step 3
document.open();
// step 4
XMLWorkerHelper.getInstance().parseXHtml(writer, document,
new FileInputStream("index.html"));
//step 5
document.close();
System.out.println( "PDF Created!" );
}
}
在这里？