Class: Fiona7::Builder::LazyBlobCopier

Inherits:
Object
  • Object
show all
Includes:
Fiona7::BinaryFilesCleaner
Defined in:
lib/fiona7/builder/lazy_blob_copier.rb

Overview

This class implements a lazy blob copy/rename operation.

Blob copy is trivial: an existing blob is taken and copied to the destination object.

Blob rename occurs, when an apparent copy is executed, that is the blob that is copied is already associated with this object (and only with this object)

The lazy part of this class is the fact that you need to call .save! on the passed destination obj to actually persist the changes in the obj

NOTE: there is an exception to the above: renaming a blob in standalone mode executes immediately

Instance Method Summary collapse

Methods included from Fiona7::BinaryFilesCleaner

#delete_unused, #unrelease_unused

Constructor Details

#initialize(attrs = {}) ⇒ LazyBlobCopier 



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# File 'lib/fiona7/builder/lazy_blob_copier.rb', line 28

def initialize(attrs={})
  @destination_obj = attrs[:destination_obj]
  @attribute       = attrs[:attr_name]
  @source_blob_id  = attrs[:source_blob_id]
  @filename        = attrs[:filename]
  @content_type    = attrs[:content_type]

  @basename, @ext  = *split_filename(@filename)
end

Instance Method Details

#call ⇒ Object 



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# File 'lib/fiona7/builder/lazy_blob_copier.rb', line 38

def call
  validate_input!

  @blob_obj   = Fiona7::WriteObj.find(@source_blob_id.to_i)
  @source_obj = find_unique_source_obj

  if @source_obj == nil
    link_orphaned_blob
  elsif @destination_obj == @source_obj
    rename_or_assign
  else
    copy
  end

  return {id: @destination_blob_id}
end