Class: CouchRest::Pager

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(db) ⇒ Pager

Returns a new instance of Pager.



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# File 'lib/couchrest/helper/pager.rb', line 4

def initialize db
  @db = db
end

Instance Attribute Details

#db ⇒ Object

Returns the value of attribute db.



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# File 'lib/couchrest/helper/pager.rb', line 3

def db
  @db
end

Instance Method Details

#all_docs(limit = 100, &block) ⇒ Object 



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# File 'lib/couchrest/helper/pager.rb', line 8

def all_docs(limit=100, &block)
  startkey = nil
  oldend = nil
  
  while docrows = request_all_docs(limit+1, startkey)        
    startkey = docrows.last['key']
    docrows.pop if docrows.length > limit
    if oldend == startkey
      break
    end
    yield(docrows)
    oldend = startkey
  end
end

#key_reduce(view, limit = 2000, firstkey = nil, lastkey = nil, &block) ⇒ Object 



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# File 'lib/couchrest/helper/pager.rb', line 23

def key_reduce(view, limit=2000, firstkey = nil, lastkey = nil, &block)
  # start with no keys
  startkey = firstkey
  # lastprocessedkey = nil
  keepgoing = true
  
  while keepgoing && viewrows = request_view(view, limit, 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, :limit => 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
    
    key = :begin
    values = []

    rows.each do |r|
      if key != r['key']
        # we're on a new key, yield the old first and then reset
        yield(key, values) if key != :begin
        key = r['key']
        values = []
      end
      # keep accumulating
      values << r['value']
    end
    yield(key, values)

  end
end