Troubleshooting - AttributeError "..." has no method "..."

Something that I've seen a few times is when a user create a function and

AttributeError: 'float' object has no attribute 'do'

Basically will do something like

def reql_cos(x)
  return x.do(lamba x: ... ))

Which throws if you call reql_cos with a float and not a ReQL term.

The proper way to define a function that may take non reql terms as arguments is to wrap them in r.expr
Something like

def reql_cos(x)
  return r.expr(x).do(lamba x: ... ))

The issue does not name a documentation file or test. Start by locating the troubleshooting documentation and review nearby entries, then add guidance for AttributeError cases caused by calling a ReQL method on a non-ReQL value, including the r.expr example shown here. Done means the troubleshooting page explains the cause and the documented remedy clearly.