Why does this happen?

pry_pollution.rb

# In some situations, methods on objects in irb and pry really aren't there.
 
# Fire up a rails app in pry.  Actually, in my case this was a CLI app.
# It happens in pry and irb.  In rails and outside of rails.
 
# I think the key is the where statement.
>> rows = User.where('email is not null')
 
# hit [tab] [tab] after typing 'path' as an example
>> rows.first.path
rows.first.path                   rows.first.path=                  rows.first.path_fingerprint     
rows.first.path_for_action        rows.first.path_info              rows.first.path_info=           
rows.first.path_parameters        rows.first.path_parameters=       rows.first.path_to_audio        
rows.first.path_to_image          rows.first.path_to_javascript     rows.first.path_to_stylesheet   
rows.first.path_to_video          rows.first.path_translated        rows.first.path_with_fingerprint
rows.first.pathname               rows.first.paths                  rows.first.paths_contain?    
 
# See?  It has a method called path.  Wtf is a database row path?  Who knows?  Let's call it!
rows.first.path
=> NoMethodError: undefined method 'path' for #<User: ...>
 
# What.
 
# But Ruby knows it isn't there when we look for it in public_methods
[25] pry(main)> rows.first.public_methods.select {|m| m.to_s.match /^path/ }
=> []
 
# So I guess it's pry or irb.