Converting a rails 2 count calculation to rails 3 -

-

i attempting convert rails 2 count calculation rails 3 i'm having issues

answers.count('user_agents.browser', :joins => :user_agent, :group => 'user_agents.browser', :order => 'count(user_agents.browser) desc')

that rails 2 , gives me error of

pgerror: error:  column answers.user_agents.browser not exist line 1: select     count("answers"."user_agents.browser") "count_...                          ^ : select     count("answers"."user_agents.browser") "count_user_agents_browser", user_agents.browser user_agents_browser       "answers"  inner join "user_agents" on "user_agents"."id" = "answers"."user_agent_id"     (answers.survey_id = 18) group  user_agents.browser order  count(user_agents.browser) desc

i've tried converting myself, close have gotten

answers.select('count(user_agents.browser)').joins(:user_agent).group('user_agents.browser').order('count(user_agents.browser) desc')

but still doesn't work , gives me error

undefined method `keys' [#<answer >, #<answer >, #<answer >]:activerecord::relation

some background, getting array of answers question model has_many answers. answers belongs useragent model has_many answers. end goal take array of answers , figure out how many came each useragent. code work in rails 2. using postgresql db.

i able figure out, , in fact think makes whole lot more sense

useragent.group(:browser).joins(:answers).merge(answers).count(:browser)

merge pretty damn awesome


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