Class: CouchRest::Pager

Inherits:
Object
  • Object
show all
Defined in:
lib/pager.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(db) ⇒ Pager

Returns a new instance of Pager.



24
25
26
 
# File 'lib/pager.rb', line 24

def initialize db
  @db = db
end

Instance Attribute Details

#db ⇒ Object

Returns the value of attribute db.



23
24
25
 
# File 'lib/pager.rb', line 23

def db
  @db
end

Instance Method Details

#key_reduce(view, count, firstkey = nil, lastkey = nil, &block) ⇒ Object 



28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
 
# File 'lib/pager.rb', line 28

def key_reduce(view, count, firstkey = nil, lastkey = nil, &block)
  # start with no keys
  startkey = firstkey
  # lastprocessedkey = nil
  keepgoing = true
  
  while keepgoing && viewrows = request_view(view, count, startkey)
    startkey = viewrows.first['key']
    endkey = viewrows.last['key']

    if (startkey == endkey)
      # we need to rerequest to get a bigger page
      # so we know we have all the rows for that key
      viewrows = @db.view(view, :key => startkey)['rows']
      # we need to do an offset thing to find the next startkey
      # otherwise we just get stuck
      lastdocid = viewrows.last['id']
      fornextloop = @db.view(view, :startkey => startkey, :startkey_docid => lastdocid, :count => 2)['rows']

      newendkey = fornextloop.last['key']
      if (newendkey == endkey)
        keepgoing = false
      else
        startkey = newendkey
      end
      rows = viewrows
    else
      rows = []
      for r in viewrows
        if (lastkey && r['key'] == lastkey)
          keepgoing = false
          break
        end
        break if (r['key'] == endkey)
        rows << r
      end   
      startkey = endkey
    end

    grouped = rows.group_by{|r|r['key']}
    grouped.each do |k, rs|
      vs = rs.collect{|r|r['value']}
      yield(k,vs)
    end
    
    # lastprocessedkey = rows.last['key']
  end
end

#request_view(view, count = nil, startkey = nil, endkey = nil) ⇒ Object 



77
78
79
80
81
82
83
84
85
86
 
# File 'lib/pager.rb', line 77

def request_view view, count = nil, startkey = nil, endkey = nil
  opts = {}
  opts[:count] = count if count
  opts[:startkey] = startkey if startkey
  opts[:endkey] = endkey if endkey
  
  results = @db.view(view, opts)
  rows = results['rows']
  rows unless rows.length == 0
end