Stympy/faker on github has lots of fun "data" for you to run in your program while you are working on them.
Every time you change a gem file you must bundle install in your terminal.

When using the post, patch and delete routes - we are not displaying information - when using these, we are going
to redirect.

flash hash - flash messages

flash[:success] = "Successfully Updated"

Associations - going on BEYOND spreedsheet style - 3D style of spreedsheet

Whenever you create a model, you also create a migration file. Once you make you the migration file, you can edit it up until
you rake db:migrate

t.timestamps - short hand for created and updated at.

three things can happen when you migrate
error/success/tumbleweeds(nothing)

schema - report of the current stucture of your database - do not change schema

If I want to change my database, I must add a new migration.

rails g migration AddPriceToProducts (ADD) attribute (changable) (To) table(changable)

Postgres does NOT allow floats. It allows decimals - takes a little extra storage, but it is more accurate for $$

string
text
integer
float
decimal
boolean
binary (images, movies, raw format)
:primary_key (helps with speed with reading/writing)
date
time
datetime
timestamp

when using decimals in databases - precision represents how many digits total,
scale is the number of digits to the right of the decimal