NoMethodError: undefined method 'time_entries' -- when trying Customer.first.time_entries in Rails console.

This is a wild shot but this is what happened to me, I made a typo in my create_time_entries migration back in the previous video where I said this:

t.belongs_to :customer_id instead of t.belongs_to :customer

I noticed the when I looked in the schema file because it said customer_id_id. I was getting the same error you were getting. So just double check your schema and migrations and if you need to change a column:

def create rename_column :table_name, :old_column, :new_column end

You might want to check your schema. I'm on this lesson right now, and the schema for time_entires should look like this:

create_table "time_entries", force: true do |t|
    t.float    "time",        limit: 24
    t.integer  "customer_id"
    t.integer  "employee_id"
    t.datetime "created_at"
    t.datetime "updated_at"

If something about your schema looks weird, it might be the same sort of error that I outlined here.

Hope this helps!