EmphasizedInsanity at /life
undefined method `Sanity` for #<EladMeidar::Developer:0x12e0670>
- file:
brain.rb - location:
instance_missing - line: 1
GET
counter_cache
Many times when using a belongs_to relation, we encounter the need to size up that association, we can use 2 methods which are created for us, size and (association_pluralization)count.
so if SuperHero has_many :super_powers than:
me = SuperHero.find(1)
me.super_powers.size
me.super_powers_count
they will both issue that same SQL statement at this point
SELECT count(*) as count_all FROM super_powers WHERE (super_hero_id = 1)
which basically preforms a SELECT * statement, we don’t like it :)
the :counter_cache parameter for the belongs_to macro, indicates the use of a (association_pluralization)count named column which will be incremented and decremented according to the use of the associative array, this can and does save a lot of time and DB – APP – DB roundup’s.
ELAD ENV
| Variable | Value |
|---|---|
| GITHUB | |
| WWR | { :working_with_rails => 'http://www.workingwithrails.com/person/5844-elad-meidar' } |
| IRC | { 'irc.freenode.net' => [ '#rubyonrails', '#railsbridge', '#ruby', '#mootools' ]} |
| SKYPE | eladmeidar |
You're seeing this error because I think it is funny.