ruby on rails - Why is my new ID always "1" -

-

i have parent-child relationship between 2 objects.

parent :has_many :children child  :belongs_to :parent

when creating new parent, in same controller, i'm creating child.

@mom = parent.new @child = child.new @mom.children << @child

that seems go okay, parent has 1 more attribute - parent has favorite child

@mom.favorite_child = @child

seems should work, except let's 61st child in database, gets id of 61 (and know happening, because when check database, child record has id of 61). reason, when assign @child parent's "favorite_child" attribute, "favorite_child" gets set "1" - when need set "61".

clues?

seems parent needs like

class parent   has_many :children   has_one :favorite_child, :foreign_key=>'favorite_child_id', :class_name => 'child'

otherwise, doesn't know it's foreign key relationship, , you're trying assign object integer.


Comments

Post a Comment

Popular posts from this blog

javascript - Enclosure Memory Copies -

-
function myclass() { //lots , lots of vars , code here. this.bar = function() { //do numerous enclosed myclass vars } this.foo = function() { alert('hello'); //don't enclosed variables. } } each instance of myclass gets own copy of bar , foo, why prototyped methods use less memory. however, know more memory use of inner methods. it seems obvious me (1) below must true. agree? not distinct myclass instances have own distinct copies of bar, must have own distinct copies of myclass enclosure. (or else how bar method keep myclass variables straight on per instance basis?) now (2) question i'm after. since inner foo method doesn't use in myclass enclosure natural qustion is: javascript smart enough not keep myclass enclosure in memory use of foo? this depend entirely on implementation not language. naive implementations keep far more around others. answer true e.g. v8 (chrome's js engine) may not true spider...
Read more

php - Replacing tags in braces, even nested tags, with regex -

-
example preg_replace('/\{[a-za-z.,\(\)0-9]+\}/', 'replaced', 'lorem ipsum dolor sit {tag1({tag2()})}, consectetur adipiscing elit.'); the result: lorem ipsum dolor sit {tag1(replaced)}, consectetur adipiscing elit. question as can see "tag2" has been replaced, want replace "tag1" know how can this? (in cases might this: {tag1({tag2({tag3()})})}) , on.) btw using preg_replace_callback, easier show preg_replace here site can test code: http://www.spaweditor.com/scripts/regex/index.php you need add curly braces character set. here's pattern used: /\{[a-za-z.,\(\)\{\}0-9]+\}/ and here result: "lorem ipsum dolor sit replaced, consectetur adipiscing elit."
Read more