craigw

>> Article.enumerate_all_tags
=> {"security"=>2, "ldap"=>1, "xen"=>1, "stories"=>3, "rails"=>13, "xeriom"=>3, "mysql"=>3, ... }

>> Article.find_all_tags
=> ["agile", "ajax", "apache", "api", "caching", "coding", ... ]

>> Article.find_all_author_ids
=> ["[email protected]"]

craigw

{
  "_id": "_design/articles",
  "_rev": "3752119467",
  "language": "javascript",
  "views": {
    "by_author_id_and_status_and_posted_at": {
      "map": "function(doc) { if(doc.type == 'article') { emit([doc.author_id, doc.status, doc.posted_at], doc); }  }"
    }
    // other view omitted for brevity
  }

craigw

Article.find(:all, :conditions => { :author_id => "[email protected]", :status => "Live" }, :order => :posted_at)

craigw

{
  "_id": "_design/articles",
  "_rev": "1532981864",
  "language": "javascript",
  "views": {
    "by_author_id_and_status": {
      "map": "function(doc) { if(doc.type == 'article') { emit([doc.author_id, doc.status], doc); }  }"
    }
    // other views cut for brevity
  }

craigw

Article.find(:all, :conditions => { :author_id => "[email protected]", :status => "Live" })

craigw

// GET http://localhost:5984/blog/_view/articles/tags?group=true&group_level=1

{"rows":[
  {"key":"awesome","value":1},
  {"key":"agile","value":2},
  {"key":"ajax","value":2},
  {"key":"apache","value":2},
  {"key":"api","value":1},
  {"key":"caching","value":1},
  {"key":"coding","value":7},

craigw

{
  "tags": {
    "map": "function(doc) { if(doc.type == 'article') { for(var i in doc.tags) { emit(doc.tags[i], 1); }}}",
    "reduce": "function(tag, counts) { var sum = 0; for(var i = 0; i < counts.length; i++) { sum += counts[i]; }; return sum; }"
  }
  // other views omitted for brevity
}

craigw

function(tag, counts) {
  var sum = 0;
  for(var i=0; i < counts.length; i++) {
     sum += counts[i];
  }
  return sum;
}

craigw

function(doc) {
  if(doc.type == 'article') {
    for(i in doc.tags) {
      emit(doc.tags[i], 1);
    }
  }
}

craigw

{
  "_id": "monkeys-are-awesome",
  "_rev": "1534115156",
  "type": "article",
  "title": "Monkeys are awesome",
  "posted_at": "2008-09-14T20:45:14Z",
  "tags": [
    "monkeys",
    "awesome"
  ],