I am attempting to generate a PDF file that contains object information and then attach it to another object that is stored in the database. The attachmentable plugin I am using is working now for user end attachments, but I need my system to be able to do it automatically.
I am using:
Grails 1.3.9
Attachmentable 0.3.0 http://grails.org/plugin/attachmentable
Rendering 0.4.3 http://grails.org/plugin/rendering
I have been able to generate and display the pdf, but do not know how to attach it using the attachmentable plugin. I need some way to take the generated pdf byte array and convert it to a MultipartFile for the attachmentable plugin function I call. The error I get shows that my argument types are invalid.
I save object1 and object2, then generate the pdf of object1 and try to attach it to object2.
Thanks in advance for you help!
Thing1 Controller Snippets:
ByteArrayOutputStream bytes = pdfRenderingService.render(template: "/thing1/pdf", model: [thing1: thing1])
attachmentableService.addAttachment("unknown", thing2.id, bytes)
AttachmentableService function I am attempting to call:
def addAttachment(def poster, def reference, CommonsMultipartFile file) {
addAttachment(CH.config, poster, reference, file)
}
def addAttachment(def config,
def poster,
def reference,
CommonsMultipartFile file) {
if (reference.ident() == null) {
throw new AttachmentableException(
"You must save the entity [${delegate}] before calling addAttachment.")
}
if (!file?.size) {
throw new EmptyFileException(file.name, file.originalFilename)
}
String delegateClassName = AttachmentableUtil.fixClassName(reference.class)
String posterClass = (poster instanceof String) ? poster : AttachmentableUtil.fixClassName(poster.class.name)
Long posterId = (poster instanceof String) ? 0L : poster.id
String filename = file.originalFilename
// link
def link = AttachmentLink.findByReferenceClassAndReferenceId(
delegateClassName, reference.ident())
if (!link) {
link = new AttachmentLink(
referenceClass: delegateClassName,
referenceId: reference.ident())
}
// attachment
Attachment attachment = new Attachment(
// file
name: FilenameUtils.getBaseName(filename),
ext: FilenameUtils.getExtension(filename),
length: 0L,
contentType: file.contentType,
// poster
posterClass: posterClass,
posterId: posterId,
// input
inputName: file.name)
link.addToAttachments attachment
if (!link.save(flush: true)) {
throw new AttachmentableException(
"Cannot create Attachment for arguments [$user, $file], they are invalid.")
}
// save file to disk
File diskFile = AttachmentableUtil.getFile(config, attachment, true)
file.transferTo(diskFile)
attachment.length = diskFile.length()
// interceptors
if(reference.respondsTo('onAddAttachment')) {
reference.onAddAttachment(attachment)
}
attachment.save(flush:true) // Force update so searchable can try to index it again.
return reference
}
Grails runtime error:
groovy.lang.MissingMethodException: No signature of method: com.macrobit.grails.plugins.attachmentable.services.AttachmentableService.addAttachment() is applicable for argument types: (java.lang.String, java.lang.Long, java.io.ByteArrayOutputStream) values: [unknown, 80536, %PDF-1.4 and a long string of unreadable data...]
Possible solutions: addAttachment(java.lang.Object, java.lang.Object, org.springframework.web.multipart.commons.CommonsMultipartFile), addAttachment(java.lang.Object, java.lang.Object, java.lang.Object, org.springframework.web.multipart.commons.CommonsMultipartFile)
Service Method I Added:
def customAddMethod(def poster, def reference, def pdfBytes) {
customAddMethod(CH.config, poster, reference, pdfBytes)
}
def customAddMethod(def config,
def poster,
def reference,
def pdfBytes) {
if (reference.ident() == null) {
throw new AttachmentableException(
"You must save the entity [${delegate}] before calling customAddMethod.")
}
String delegateClassName = AttachmentableUtil.fixClassName(reference.class)
String posterClass = (poster instanceof String) ? poster : AttachmentableUtil.fixClassName(poster.class.name)
Long posterId = (poster instanceof String) ? 0L : poster.id
String filename = "File Name"
// link
def link = AttachmentLink.findByReferenceClassAndReferenceId(
delegateClassName, reference.ident())
if (!link) {
link = new AttachmentLink(
referenceClass: delegateClassName,
referenceId: reference.ident())
}
// attachment
Attachment attachment = new Attachment(
// file
name: "File Name",
ext: "pdf",
length: 0L,
contentType: "application/pdf",
// poster
posterClass: posterClass,
posterId: posterId,
// input
inputName: "File Name")
link.addToAttachments attachment
if (!link.save(flush: true)) {
throw new AttachmentableException(
"Cannot create Attachment for arguments [$user, $file], they are invalid.")
}
// save file to disk
byte[] bytes = pdfBytes.toByteArray(); //convert ByteArrayOutputStream to ByteArray
File diskFile = AttachmentableUtil.getFile(config, attachment, true) //file path
FileOutputStream fos = new FileOutputStream(diskFile); //open file output stream to write to
fos.write(bytes); //write rendered pdf bytes to file
fos.flush();
fos.close();
attachment.length = diskFile.length()
// interceptors
if(reference.respondsTo('onAddAttachment')) {
reference.onAddAttachment(attachment)
}
attachment.save(flush:true) // Force update so searchable can try to index it again.
return reference
}
It looks like the AttachmentableService you referenced (from the Attachmentable plugin) assumes it's dealing with a file-upload scenario, such that you could easily grab the MultipartFile instance via request.getFile(). That's not the case for you - you're creating the file via the Rendering plugin, and you want that file attached to a domain object, right?
You could try constructing a CommonsMultipartFile instance manually by first writing the pdf bytes to disk, and then create a DiskFileItem via DiskFileItemFactory. See this post for an example of what I'm thinking: How to make CommonsMultipartFile from absolute file path?
Another, better, option might be to checkout that plugin's source and add a method that doesn't require you to go through those gyrations - perhaps a version of the addAttachment method that accepts a File or an OutputStream instead - and submit a PR to the plugin author. (Looks like they're adding an 'addAttachment' method to qualifying domain objects, which also expects a CommonsMultipartFile).
Otherwise, you might just have to create your own service to basically provide the same end result, which apparently is to create an AttachmentLink and associated Attachment instance.