Turning off auto indent when pasting text into vim

I am making the effort to learn Vim.

When I paste code into my document from the clipboard, I get extra spaces at the start of each new line:

line
  line
    line

I know you can turn off auto indent but I can't get it to work because I have some other settings conflicting or something (which look pretty obvious in my .vimrc but don't seem to matter when I take them out).

How do I turn off auto indenting when I paste code but still have vim auto indent when I am writing code? Here is my .vimrc file:

set expandtab  
set tabstop=2  
set shiftwidth=2  
set autoindent  
set smartindent  
set bg=dark  
set nowrap