Your Existence Your Existence
A presentation at RubyMotion Inspect in July 2015 in Paris, France by Gant Laborde
Your Existence Your Existence
Proofreeded buy Proofreeded buy Jamon Holmgren Jamon Holmgren
Who am I? Who am I?
@GantLaborde @GantLaborde Public Spe ak er Writ er Coder
Title Text Title Text
Trusting User Input Trusting User Input
Crazy or Lazy? Crazy or Lazy?
Start with ideal API Start with ideal API
Have smart people Have smart people help! help!
Ideal Validation? Ideal Validation?
valid?(
98.6 , : number )
#=> true
Get user input T HEN v alidat e it in some place.
Stop them at the Stop them at the Source Source
Ideal Validation? Ideal Validation? t ak e 2
@username_textfield.validates(
:number ).on( :invalid ) do
end
Validation as a Utility Validation as a Utility 1/5
H a n d l e
c o m m o n
v a l i d a t i o n
n e e d s
r m q . v a l i d a t i o n . v a l i d ? ( ' t e s t @ t e s t . c o m ' ,
: e m a i l )
r e t u r n s
t r u e
r m q . v a l i d a t i o n . v a l i d ? ( ' 5 0 4 5 5 5 8 9 8 9 ' ,
: u s p h o n e )
r e t u r n s
t r u e
r m q . v a l i d a t i o n . v a l i d ? ( ' 9 0 2 1 0 ' ,
: u s z i p )
r e t u r n s
f a l s e
Validation as a Utility Validation as a Utility 2/5 :email :url :dat eiso :number :digits :ip v4 :time :uszip :ukzip :usphone :str ong_p assw or d :has_upper :has_l o w er :pr esenc e :l ength
Validation as a Utility Validation as a Utility 3/5 # Make
it
Flexable
rmq .validation .valid ?( 'test' , :length, exact_length : 4 ) #true
rmq .validation .valid ?( 'test' , :length, min_length : 4 ) #true
rmq .validation .valid ?( 'test' , :length, max_length : 4 ) #true
rmq .validation .valid ?( 'test' , :length, min_length : 2 , max_length : 7 ) #true
rmq .validation .valid ?( 'test' , :length, exact_length : 2 .. 7 ) #true
rmq .validation .valid ?( ' test ' , :length, max_length : 5 , strip : true) #true
Validation as a Utility Validation as a Utility 4/5
R o l l
y o u r
o w n !
r m q . v a l i d a t i o n . v a l i d ? ( ' n a c h o ' ,
: c u s t o m ,
r e g e x :
R e g e x p . n e w ( ' n a c h o s ? ' ) )
t r u e
Things that validation has to think about? Things that validation has to think about? allow_blank white_list Validation as a Utility Validation as a Utility 5/5
Friday Friday
Validation as a Rule Validation as a Rule Built on the Utility
Validation as a Rule Validation as a Rule
A d d
a
r u l e
t o
a
t e x t f i e l d
r m q ( @ u s e r _ e m a i l ) . v a l i d a t e s ( : e m a i l )
A d d
r u l e
a s s
w e
a p p e n d
f i e l d s
r m q . a p p e n d ( U I T e x t F i e l d ,
: w e i g h t ) . v a l i d a t e s ( : d i g i t s )
r m q . a p p e n d ( U I T e x t F i e l d ,
: n a m e ) . v a l i d a t e s ( : p r e s e n c e )
C h e c k
t h a t
i n p u t
r m q ( @ u s e r _ e m a i l ) . v a l i d ?
C h e c k
e v e r y
a p p l i e d
r u l e
r m q . a l l . v a l i d ?
Who's Bad? Who's Bad?
rmq(some_selection_criteria).invalid
rmq(some_selection_criteria).valid
rmq.all.valid?
rmq.all.invalid
rmq.all.valid
Who's Bad? Who's Bad?
rmq.append(UITextField).validates( :digits ).on( :valid ) do
#valid
puts "WOWZERZ field is valid <3 <3 <3"
end .on( :invalid ) do
|invalid|
#invalid
puts "NOOOOOOOOOOOOO!!!1!1"
end
Easy Come - Easy Go Easy Come - Easy Go
rmq(some_selection).clear_validations!
rmq.all.clear_validations!
Informative Errors Informative Errors
We can be friendly We can be friendly validation_errors
R e t u r n s
a r r a y
o f
e r r o r
m e s s a g e s
f o r
e v e r y
i n v a l i d
i t e m
i n
s e l e c t i o n
r m q . a l l . v a l i d a t i o n _ e r r o r s
E . G
[ " V a l i d a t i o n
E r r o r
i n p u t
r e q u i r e s
v a l i d
e m a i l . " ]
We can be friendly We can be friendly custom error messages custom error messages
d o
t h i s
i n
y o u r
s t y l e s h e e t
d e f
u s e r ( s t )
c u s t o m
v a l i d a t i o n
i m a g e s
s t . v a l i d a t i o n _ e r r o r s
=
{
e m a i l :
" P l e a s e
c h e c k
y o u r
u s e r
e m a i l
a n d
t r y
a g a i n "
}
e n d
o v e r r i d e s
" V a l i d a t i o n
E r r o r
i n p u t
r e q u i r e s
v a l i d
e m a i l . "
Custom Validations Custom Validations with Selection Rules!?! with Selection Rules!?! Custom Validations Custom Validations with Selection Rules!?! with Selection Rules!?!
Custom Validation Custom Validation Rules Rules the e asy w ay - simple r egex
a p p e n d ( U I T e x t F i e l d ) . v a l i d a t e s ( : c u s t o m ,
r e g e x :
/ ^ t e s t $ / )
Custom Validation Custom Validation Rules Rules
r m q . v a l i d a t i o n . a d d _ v a l i d a t o r ( : f i r s t _ l e t t e r )
d o
| v a l u e ,
o p t s |
v a l u e . s t a r t _ w i t h ? ( o p t s [ : l e t t e r ] )
e n d No w use it!
s o m e _ f i e l d
=
a p p e n d ( U I T e x t F i e l d ) . v a l i d a t e s ( : f i r s t _ l e t t e r ,
l e t t e r :
' x ' )
s o m e _ f i e l d . d a t a ( " t e s t " )
s o m e _ f i e l d . v a l i d ?
=
f a l s e
s o m e _ f i e l d . d a t a ( " x e n o p h o b i a " )
s o m e _ f i e l d . v a l i d ?
=
t r u e
Mark Rick ert (aka the "Bad Bo y of Rub yMotion" )
Hangin' with BroBama Hangin' with BroBama
The Future of The Future of Validation Validation
Thanks! Thanks! Thanks! Thanks!
