Class: Coupler::Models::Import

Inherits:
Sequel::Model
  • Object
show all
Includes:
CommonModel, Jobify
Defined in:
lib/coupler/models/import.rb

Constant Summary collapse

DateMatcher =

NOTE: yoinked from FasterCSV A Regexp used to find and convert some common Date formats.

/ \A(?: (\w+,?\s+)?\w+\s+\d{1,2},?\s+\d{2,4} |
\d{4}-\d{2}-\d{2} )\z /x
DateTimeMatcher =

A Regexp used to find and convert some common DateTime formats.

/ \A(?: (\w+,?\s+)?\w+\s+\d{1,2}\s+\d{1,2}:\d{1,2}:\d{1,2},?\s+\d{2,4} |
\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2} )\z /x

Instance Method Summary collapse

Methods included from Jobify

included

Methods included from CommonModel

#after_destroy, #after_save, #before_create, #before_save, #before_update, included, #save!, #touch!

Instance Method Details

#data=(value) ⇒ Object 



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# File 'lib/coupler/models/import.rb', line 22

def data=(value)
  result = super
  self.name ||= File.basename(data.file.original_filename).sub(/\.\w+?$/, "").gsub(/[_-]+/, " ").capitalize
  discover_fields
  result
end

#dataset ⇒ Object 



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# File 'lib/coupler/models/import.rb', line 128

def dataset
  project.local_database do |db|
    yield(db[table_name])
  end
end

#import!(&progress) ⇒ Object 



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# File 'lib/coupler/models/import.rb', line 53

def import!(&progress)
  project.local_database do |db|
    column_info = []
    column_names = []
    column_types = []
    field_names.each_with_index do |name, i|
      name_sym = name.to_sym
      column_names << name_sym
      column_types << {
        :name => name_sym,
        :type =>
          case field_types[i]
          when 'integer' then Integer
          when 'string' then String
          end,
        :null => !(name == primary_key_name)
      }
    end
    column_names << :dup_key_count
    column_types << {:name => :dup_key_count, :type => Integer}
    db.create_table!(table_name) do
      columns.push(*column_types)
    end

    ds = db[table_name]
    key_frequencies = Hash.new { |h, k| h[k] = 0 }
    buffer = ImportBuffer.new(column_names, ds)
    skip = has_headers
    primary_key_index = field_names.index(primary_key_name)
    io = File.open(data.file.file, 'rb')
    csv = FasterCSV.new(io)
    csv.each do |row|
      if skip
        # skip header if necessary
        skip = false
        next
      end

      # convert values
      row.each_with_index do |value, i|
        row[i] = coerce(value, field_types[i])
      end

      key = row[primary_key_index]
      num = key_frequencies[key] += 1
      row.push(num > 1 ? num : nil)
      self.has_duplicate_keys = true if num > 1

      buffer.add(row)

      if block_given?
        yield io.pos
      end
    end
    buffer.flush

    primary_key = self.primary_key_sym
    if has_duplicate_keys
      # flag duplicate primary keys
      key_frequencies.each_pair do |key, count|
        next  if count == 1
        ds.filter(primary_key => key, :dup_key_count => nil).update(:dup_key_count => 1)
      end
    else
      # alter table to set primary key
      db.alter_table(table_name) do
        drop_column(:dup_key_count)
        add_primary_key([primary_key])
      end
    end
  end
  update(:occurred_at => Time.now)
  !has_duplicate_keys
end

#preview ⇒ Object 



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# File 'lib/coupler/models/import.rb', line 37

def preview
  if @preview.nil?
    @preview = []
    FasterCSV.open(data.file.file) do |csv|
      csv.rewind
      csv.shift   if self.has_headers
      50.times do |i|
        row = csv.shift
        break if row.nil?
        @preview << row
      end
    end
  end
  @preview
end

#primary_key_sym ⇒ Object 



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# File 'lib/coupler/models/import.rb', line 29

def primary_key_sym
  primary_key_name.to_sym
end

#repair_duplicate_keys!(rows_to_remove = nil) ⇒ Object 



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# File 'lib/coupler/models/import.rb', line 134

def repair_duplicate_keys!(rows_to_remove = nil)
  pkey = primary_key_sym
  project.local_database do |db|
    ds = db[table_name]
    if rows_to_remove
      filtered_ds = nil
      rows_to_remove.each_pair do |key, dups|
        hsh = {pkey => key, :dup_key_count => dups}
        filtered_ds = filtered_ds ? filtered_ds.or(hsh) : ds.filter(hsh)
      end
      filtered_ds.delete if filtered_ds
    end

    # only reassign keys if there is more than 1 duplicate per key
    keys = ds.group(pkey).having { count(pkey) > 1 }.select_map(pkey)

    current_key = nil
    next_key = ds.order(pkey).last[pkey].next
    ds.filter(pkey => keys).order(:dup_key_count).each do |row|
      # skip the first one, since it'll retain the key
      if current_key != row[pkey]
        current_key = row[pkey]
      else
        ds.filter(pkey => row[pkey], :dup_key_count => row[:dup_key_count]).
          update(pkey => next_key)
        next_key = next_key.next
      end
    end

    db.alter_table(table_name) do
      drop_column(:dup_key_count)
      add_primary_key([pkey])
    end
  end
end

#table_name ⇒ Object 



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# File 'lib/coupler/models/import.rb', line 33

def table_name
  :"import_#{id}"
end