How to prefix http to multiple columns' url input from users in Rails? -


this question has answered question single column how do multiple columns? i've got 3 columns (website, fb, twitter) want prefix http in case users don't input them in form.

i tried doesn't work:

before_save :sanitize_links private def sanitize_links website = self.website facebook = self.facebook twitter = self.twitter links = [website, facebook, twitter] links.each |link| unless link.include?("http://") || link.include?("https://") link = "http://" + link end end end

update

i've tried suggestion kl-7 unfortunately hit little snag. how use output of array before_save? i've tried code below doesn't work.

before_save :sanitize_links private def sanitize_links links = ["website", "facebook", "twitter"] links.map! { |link| self.link =~ %r{\ahttps?://} ? self.link : "http://" + self.link } end

update 2

i gave up. i'll repeat 3 times:

before_save :sanitize_links private def sanitize_links # prefix user-submitted links http:// if missing self.website =~ %r{\ahttps?://} ? self.website : self.website = "http://" + self.website self.facebook =~ %r{\ahttps?://} ? self.facebook : self.facebook = "http://" + self.facebook self.twitter =~ %r{\ahttps?://} ? self.twitter : self.twitter = "http://" + self.twitter end

the problem 

link = "http://" + link

in code assigns new value link variable withing block, doesn't change corresponding element of list.

to alter elements of list in-place can use array#map!:

links.map! |link| link.include?("http://") || link.include?("https://") ? link : "http://" + link end

another thing i'm bit worried include? return true if given substring (e.g., 'http://' occurs somewhere in middle of string , not @ beginning. i'd rather use regexp task:

links.map! { |link| link =~ %r{\ahttps?://} ? link : "http://" + link }

update

if link attribute of model, should @ least store attribute , not local links variable:

self.links = links.map { |link| link =~ %r{\ahttps?://} ? link : "http://" + link }

Comments

Post a Comment

Popular posts from this blog

javascript - backbone.js Collection.add() doesn't `construct` (`initialize`) an object -

<!doctype html public "-//w3c//dtd xhtml 1.0 strict//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-strict.dtd"> <html> <head> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script> <script src="http://documentcloud.github.com/underscore/underscore-min.js"></script> <script src="http://documentcloud.github.com/backbone/backbone-min.js"></script> </head> <body> <button id="cmd_create_event" name="cmd_create_event" type="button">create new `event`</button> <script type="text/javascript"> var eventmodel = backbone.model.extend({ initialize : function() { console.log("`event` initialized. id: " + this.cid); this.bind("change:status", function() { console.log(this.get("status") + " value `status`"); }); this.bind("error", function(model, e...
Read more

c++ - Accessing inactive union member and undefined behavior? -

i under impression accessing union member other last 1 set ub, can't seem find solid reference (other answers claiming it's ub without support standard). so, undefined behavior? the confusion c explicitly permits type-punning through union, whereas c++ ( c++11 ) has no such permission. c11 6.5.2.3 structure , union members 95) if member used read contents of union object not same member last used store value in object, appropriate part of object representation of value reinterpreted object representation in new type described in 6.2.6 (a process called ‘‘type punning’’). might trap representation. the situation c++: c++11 9.5 unions [class.union] in union, @ 1 of non-static data members can active @ time, is, value of @ 1 of non-static data members can stored in union @ time. c++ later has language permitting use of unions containing struct s common initial sequences; doesn't permit type-punning. to determine whether union type-punning is allowe...
Read more

php - Get uncommon values from two or more arrays -

is there function in php give array of uncommon values 2 or more arrays? for example: $array1 = array( "green", "red", "blue"); $array2 = array( "green", "yellow", "red"); .... $result = function_needed($array1, $array2,...); print_r($result); should give output: array("blue", "yellow", ...); use array_diff , array_merge : $result = array_merge(array_diff($array1, $array2), array_diff($array2, $array1)); here's demo. for multiple arrays, combine callback , array_reduce : function unique(&$a, $b) { return $a ? array_merge(array_diff($a, $b), array_diff($b, $a)) : $b; } $arrays = array( array('green', 'red', 'blue'), array('green', 'yellow', 'red') ); $result = array_reduce($arrays, 'unique'); and here's demo of that.
Read more