Personal Ruby On Rails cheatsheet
| Methods | present? - | exists? | any? + |
blank? - |
empty? + |
none? | one?/many? | size + |
count - |
length |
|---|---|---|---|---|---|---|---|---|---|---|
| DB hit | X | X | X | |||||||
| Memory Load | X | X | X | X | ||||||
| Smart | X | X | X | X |
+: recommended -: do not use
Note:
one? many? : using size