More criteria functions

[jwoertink]

I was having a little fun and decided to add just a few more I thought may be helpful.

This adds a few extra Criteria functions

• LENGTH()
• REVERSE()
• ABS()
• CEIL()
• FLOOR()

# Find all users that have a username length of 6 characters
UserQuery.new.username.length.eq(6)

# Find all users where the secret in reverse is equal to "terces"
UserQuery.new.secret.reverse.eq("terces")

# Find all transactions where the abs amount is 400 (i.e. matches 400 and -400)
TransactionQuery.new.amount.abs.eq(400)

# Find all purchases where the amount rounded up is equal to 40.0
PurchaseQuery.new.amount.ceil.eq(40.0)

# Find all purchases where the amount rounded down is equal to 30.0
PurchaseQuery.new.amount.floor.eq(30.0)

[jwoertink]

Although in postgres the value looks like an integer when using these, the type is numeric which maps to Float64 in Crystal.