Fog not uploading entire file to S3 - ruby

Question

I'm using a ruby script to generate an html page that I'm uploading to s3. My amazon bucket is configured to work as a static website, and the html page my script is generating is the index page.
I've created a couple of models to build a connection to s3 using the fog gem, generate the html page, and then push it up to s3.
When I use the script to push the file up to s3, I don't get any errors, but only half the file gets uploaded. It happens regardless of file size. I inevitably wind up with about 15 rows missing from the html table I generated.
The relevant code from my FogManager model is this:
def connect
#connection = Fog::Storage.new({
provider: 'AWS',
aws_access_key_id: AWS_ACCESS_KEY,
aws_secret_access_key: AWS_SECRET_KEY,
persistent: true
})
end
def locate_directory
#directory = #connection.directories.get(DIRECTORY)
end
def upload_report_page(index_file)
file = #directory.files.get(index_file)
file.body = File.open(index_file)
file.acl = 'public-read'
file.save
end
My script looks something like:
filename = "index.html"
s3 = FogManager.new
s3.connect
s3.locate_directory
# code for generating the html page
s3.upload_report_page(filename)
All of the code works, but the whole html file isn't getting uploaded to s3.
I'm using the latest version of fog (1.15.0) with ruby 2.0.0p0
I've been able to manually go into irb and establish an s3 connection, locate the file, and upload the new one. I use these commands:
require 'fog'
connection = Fog:Storage({provider: 'AWS',
aws_access_key_id: 'xxx',
aws_secret_access_key: 'xxx',
persistent: true})
directory = connection.directories.get('my_directory')
file = directory.files.get('index.html')
file.body = File.open('index.html')
file.acl = 'public-read'
file.save
When I upload the file this way, it works properly, and the whole file gets uploaded, but it defeats the purpose of having the script.
Any insight would be greatly appreciated!