Problem with the Views(Map/Reduce) example

[7stud]

Couchbase: Community Edition 5.0.1 build 5003

I'm having problems with the Views example on the README page. When I do:

res.each do |row|
  # Returns extended results by default
  puts "#{row.key}: #{row.value}"
end

The output I get is:

hello-world: {:title=>"Hello World", :body=>"Well hello and welcome to my new blog...", :date=>"2009/01/15 15:52:20"}
biking: {:title=>"Biking", :body=>"My biggest hobby is mountainbiking. The other day...", :date=>"2009/01/30 18:04:11"}
bought-a-cat: {:title=>"Bought a Cat", :body=>"I went to the the pet store.", :date=>"2009/01/30 20:04:11"}

I expected the output:

"2009/01/15 15:52:20": "Hello World"
"2009/01/30 18:04:11": "Biking"  
"2009/01/30 20:04:11": "Bought a Cat"

Because the map function is this:

     "map": "function(doc){if(doc.date && doc.title){emit(doc.date, doc.title);}}"

I think map() should emit the date as row.key and the title as row.value.

Full code, which is copied from the README:

require 'libcouchbase'

bucket = Libcouchbase::Bucket.new(
  hosts: '127.0.0.1', 
  bucket: 'recent-posts', 
  username: '7stud',
  password: 'abc123')


bucket['biking'] = {:title => 'Biking',
                   :body => 'My biggest hobby is mountainbiking. The other day...',
                   :date => '2009/01/30 18:04:11'}
bucket['bought-a-cat'] = {:title => 'Bought a Cat',
                          :body => 'I went to the the pet store.',
                          :date => '2009/01/30 20:04:11'}
bucket['hello-world'] = {:title => 'Hello World',
                        :body => 'Well hello and welcome to my new blog...',
                        :date => '2009/01/15 15:52:20'}

view_doc = %q|
    {
      "_id": "_design/blog",
      "language": "javascript",
      "views": {
        "recent_posts": {
          "map": "function(doc){if(doc.date && doc.title){emit(doc.date, doc.title);}}"
        }
      }
    }
|

bucket.save_design_doc(view_doc)

blog = bucket.design_docs['blog']
p blog.views    

res = blog.view('recent_posts')  #=> #<Libcouchbase::Results:0x007fbaed12c988>

res.each do |row|
  # Returns extended results by default
  puts "#{row.key}: #{row.value}"
end

I'm not sure what the comment #Returns extended results by default means. If I do:

res = blog.view('recent_posts', include_docs: false)

then my results are:

hello-world: 
biking: 
bought-a-cat: 

It doesn't seem to matter what the map function emit()'s because the results are always the same. For instance, I get the same output with emit(1, 2), emit('abc', '123'), and emit(doc.date, doc.title)

[stakach]

This is the expected behaviour. My primary use case was to use the emitted values for filtering or ordering. The key is always set to the key of the document that emitted the value - you can see the structure that couchbase sends back here:
https://github.com/cotag/libcouchbase/blob/master/lib/libcouchbase/ext/libcouchbase/respviewquery.rb

For the emitted values, you want to look at:

res.each do |row|
  # See what was emitted 
  puts row.metadata[:emitted]
end

This isn't parsed, so at this point will be a string. (Probably an array represented in JSON? I'm not actually sure)

You can see how the response from couchbase is processed here: https://github.com/cotag/libcouchbase/blob/master/lib/libcouchbase/query_view.rb#L77