Module: Mooncats::Dataset

Defined in:
lib/mooncats/dataset.rb

Class Method Summary collapse

Class Method Details

.read(path = './datasets/mooncats/*.csv') ⇒ Object 



6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
 
# File 'lib/mooncats/dataset.rb', line 6

def self.read( path='./datasets/mooncats/*.csv' )

  datasets = Dir.glob( path )
  ## pp datasets
  #=> ["./datasets/mooncats/00.csv",
  #    "./datasets/mooncats/01.csv",
  #    "./datasets/mooncats/02.csv",
  #    "./datasets/mooncats/03.csv",
  #    "./datasets/mooncats/04.csv",
  #     ...]

  rows = []
  datasets.each do |dataset|
    rows += CsvHash.read( dataset )
  end

  ## puts "  #{rows.size} rows(s)"
  #=> 25440 rows(s)


  ### wrap in mooncat struct for easier access
  mooncats = []
  rows.each_with_index do |row,i|
    ## print "."  if i % 100
    id    = row['id']
    ## note: skip all derived column from id e.g.
    ##        - r,g,b, etc.

    ## add some more (extra) columns
    mint      = row['mint'].to_i
    block     = row['block'].to_i
    ## expected timestamp format like
    ##   2017-09-06 15:03:43 UTC
    timestamp = DateTime.strptime( row['timestamp'], '%Y-%m-%d %H:%M:%S %z')

    mooncats << Metadata.new( id,
                              mint:      mint,
                              block:     block,
                              timestamp: timestamp )
  end
  ## print "\n"   ## add progress

  mooncats
end