assets pipeline

gistfile1.rb

# For sprockets-2.1.3

# in lib/sprockets/asset.rb 
# Asset class, initialize method
# just use path
      @digest       = environment.file_digest(pathname).hexdigest
      puts "========== Assets::initialize:pathname #{pathname}"
      puts "========== Assets::initialize:@digest #{@digest}"


# in lib/sprockets/processed_asset.rb 
# ProcessedAsset < Asset, initialize method
# the source over here is the content be processed (like .coffee, scss),  if it need processed 
# , it will also do some compressed(remove space etc...)
# will execute processor(syntax process, check?) and compress here
      @digest = environment.digest.update(source).hexdigest
      puts "========= ProcessedAsset::initialize:source #{source}"
      puts "========= ProcessedAsset::initialize:@digest #{@digest}"

# in lib/sprockets/bundled_asset.rb 
# the source before
# BundledAsset < Asset, initialize method
# the source over here is the content be compressed
      @digest = environment.digest.update(source).hexdigest
      puts "SP========= BundledAsset::initialize:source #{source}"
      puts "SP========= BundledAsset::initialize:@digest #{@digest}"


# So like pure .js or .css it don't need processed in ProcessedAsset, then it will be compressed
# in BundleAsset, then this two @digest in ProcessedAsset and BundledAsset will be different
# but if it need to be processed, then the two @digest will be the same.