Class: Marty::DataGrid

Inherits:
Base show all
Defined in:
app/models/marty/data_grid.rb,
app/services/marty/data_grid/constraint.rb

Defined Under Namespace

Classes: Constraint, DataGridValidator

Constant Summary collapse

DEFAULT_DATA_TYPE =

If data_type is nil, assume float

'float'
INDEX_MAP = 
{
  'numrange'  => Marty::GridIndexNumrange,
  'int4range' => Marty::GridIndexInt4range,
  'integer'   => Marty::GridIndexInteger,
  'string'    => Marty::GridIndexString,
  'boolean'   => Marty::GridIndexBoolean,
}.freeze
ARRSEP = 
'|'.freeze
NOT_STRING_START = 
'NOT ('.freeze
NOT_STRING_END = 
')'.freeze
PLV_DT_FMT = 
'%Y-%m-%d %H:%M:%S.%N6'

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

get_final_attrs, make_hash, make_openstruct, mcfly_pt

Methods inherited from ActiveRecord::Base

joins, old_joins

Class Method Details

.clear_dtcache ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 181

def self.clear_dtcache
  @@dtcache = {}
end

.convert_data_type(data_type) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 170

def self.convert_data_type(data_type)
  # given data_type, convert it to class and or known data type --
  # returns nil if data_type is invalid

  return DEFAULT_DATA_TYPE if data_type.nil?
  return data_type if
    Marty::DataConversion::DATABASE_TYPES.member?(data_type.to_sym)

  data_type.constantize rescue nil
end

.create_from_import(name, import_text, created_dt = nil) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 614

def self.create_from_import(name, import_text, created_dt = nil)
  parsed_result = parse(created_dt, import_text, {})

  metadata = parsed_result[:metadata]
  data = parsed_result[:data]
  data_type = parsed_result[:data_type]
  lenient = parsed_result[:lenient]
  constraint = parsed_result[:constraint]

  dg            = new
  dg.name       = name
  dg.data       = data
  dg.data_type  = data_type
  dg.lenient    = !!lenient
  dg.metadata   = metadata
  dg.created_dt = created_dt if created_dt
  dg.constraint = constraint
  dg.save!
  dg
end

.export_keys(inf) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 321

def self.export_keys(inf)
  # should unify this with Marty::DataConversion.convert

  type = inf['type']
  nots = inf.fetch('nots', [])
  klass = type.constantize unless INDEX_MAP[type]

  keys = inf['keys'].map do |v|
    case type
    when 'numrange', 'int4range'
      Marty::Util.pg_range_to_human(v)
    when 'boolean'
      v.to_s
    when 'string', 'integer'
      v.map(&:to_s).join(ARRSEP) if v
    else
      # assume it's an AR class
      v.each do |k|
        begin
          # check to see if class instance actually exists
          Marty::DataGrid.
            find_class_instance('infinity', klass, k) || raise(NoMethodError)
        rescue NoMethodError
          raise "instance #{k} of #{type} not found"
        end
      end if v
      v.join(ARRSEP) if v
    end
  end

  keys.each_with_index.map do |v, index|
    next v unless nots[index]

    add_not(v)
  end
end

.get_struct_attrs ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 118

def self.get_struct_attrs
  self.struct_attrs ||= super + ['id', 'group_id', 'created_dt', 'name']
end

.lookup_grid_distinct_entry_h(pt, h, dgh, visited = nil, follow = true, return_grid_data = false, distinct = true) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 268

def self.lookup_grid_distinct_entry_h(
  pt, h, dgh, visited = nil, follow = true,
  return_grid_data = false, distinct = true
)

  # Perform grid lookup, if result is another data_grid, and follow is true,
  # then perform lookup on the resulting grid.  Allows grids to be nested
  # as multi-grids.  If return_grid_data is true, also return the grid
  # data and metadata
  # return is a hash for the grid results:
  #
  #   "result"   => <result of running the grid>
  #   "name"     => <grid name>
  #   "data"     => <grid's data array>
  #   "metadata" => <grid's metadata (array of hashes)>
  vhash = plpg_lookup_grid_distinct(h, dgh, return_grid_data, distinct)

  return vhash if vhash['result'].nil? || !dgh['data_type']

  c_data_type = Marty::DataGrid.convert_data_type(dgh['data_type'])

  return vhash if String === c_data_type

  res = vhash['result']

  v = if ::Marty::EnumHelper.pg_enum?(klass: res)
        c_data_type.find_by_name(res)
      elsif Marty::DataGrid == c_data_type
        follow ?
          Marty::DataGrid.lookup_h(pt, res) :
          Marty::DataGrid.lookup(pt, res)
      else
        Marty::DataConversion.find_row(c_data_type, { 'name' => res }, pt)
      end

  return vhash.merge('result' => v) unless
    Marty::DataGrid == c_data_type && follow

  visited ||= []

  visited << dgh['group_id']

  raise "#{self.class} recursion loop detected -- #{visited}" if
    visited.member?(v['group_id'])

  lookup_grid_distinct_entry_h(
    pt, h, v, visited, follow, return_grid_data, distinct)
end

.maybe_get_klass(type) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 466

def self.maybe_get_klass(type)
    type.constantize unless INDEX_MAP[type] || type == 'float'
rescue NameError
    raise "unknown header type/klass: #{type}"
end

.parse(pt, grid_text, options) ⇒ Object

parse grid external representation into metadata/data



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# File 'app/models/marty/data_grid.rb', line 489

def self.parse(pt, grid_text, options)
  options[:headers] ||= false
  options[:col_sep] ||= "\t"

  pt ||= 'infinity'

  rows = CSV.new(grid_text, options).to_a
  blank_index = rows.find_index { |x| x.all?(&:nil?) }

  raise 'must have a blank row separating metadata' unless
    blank_index

  raise "can't import grid with trailing blank column" if
    rows.map { |r| r.last.nil? }.all?

  raise "last row can't be blank" if rows[-1].all?(&:nil?)

  data_type, lenient = nil, false

  # check if there's a data_type definition
  dt, constraint, *x = rows[0]
  if dt && x.all?(&:nil?)
    dts = dt.split
    raise "bad data type '#{dt}'" if dts.count > 2

    lenient = dts.delete 'lenient'
    data_type = dts.first
  end
  constraint = nil if x.first.in?(['v', 'h'])

  start_md = constraint || data_type || lenient ? 1 : 0
  rows_for_metadata = rows[start_md...blank_index]
  metadata = rows_for_metadata.map do |attr, type, dir, rs_keep, key|
    raise 'metadata elements must include attr/type/dir' unless
      attr && type && dir
    raise "bad dir #{dir}" unless ['h', 'v'].member? dir
    raise "unknown metadata type #{type}" unless
      Marty::DataGrid.type_to_index(type)

    keys = key && parse_keys(pt, [key], type)
    nots = key && parse_nots(pt, [key])

    res = {
      'attr' => attr,
      'type' => type,
      'dir'  => dir,
      'keys' => keys,
      'nots' => nots,
    }
    res['rs_keep'] = rs_keep if rs_keep
    res
  end

  v_infos = metadata.select { |inf| inf['dir'] == 'v' }
  h_infos = metadata.select { |inf| inf['dir'] == 'h' }

  # keys+data start right after blank_index
  data_index = blank_index + 1

  # process horizontal key rows
  h_infos.each_with_index do |inf, i|
    row = rows[data_index + i]

    raise "horiz. key row #{data_index + i} must include nil starting cells" if
      row[0, v_infos.count].any?

    inf['keys'] = parse_keys(pt, row[v_infos.count, row.count], inf['type'])
    inf['nots'] = parse_nots(pt, row[v_infos.count, row.count])
  end

  raise 'horiz. info keys length mismatch!' unless
    h_infos.map { |inf| inf['keys'].length }.uniq.count <= 1

  data_rows = rows[data_index + h_infos.count, rows.count]

  # process vertical key columns
  v_key_cols = data_rows.map { |r| r[0, v_infos.count] }.transpose

  v_infos.each_with_index do |inf, i|
    inf['keys'] = parse_keys(pt, v_key_cols[i], inf['type'])
    inf['nots'] = parse_nots(pt, v_key_cols[i])
  end

  raise 'vert. info keys length mismatch!' unless
    v_infos.map { |inf| inf['keys'].length }.uniq.count <= 1

  c_data_type = Marty::DataGrid.convert_data_type(data_type)

  raise "bad data type #{data_type}" unless c_data_type

  # based on data type, decide to check using convert or instance
  # lookup.  FIXME: DRY.

  if String === c_data_type
    tsym = c_data_type.to_sym

    data = data_rows.map do |r|
      r[v_infos.count, r.count].map do |v|
        next v unless v

        Marty::DataConversion.convert(v, tsym)
      end
    end
  else
    data = data_rows.map do |r|
      r[v_infos.count, r.count].map do |v|
        next v unless v

        next v if Marty::DataGrid.
                       find_class_instance(pt, c_data_type, v)

        raise "can't find key '#{v}' for class #{data_type}"
      end
    end
  end

  {
    metadata: metadata,
    data: data,
    data_type: data_type,
    lenient: lenient,
    constraint: constraint,
  }
end

.parse_fvalue(pt, v, type, klass) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 417

def self.parse_fvalue(pt, v, type, klass)
  return unless v

  v = remove_not(v)

  case type
  when 'numrange', 'int4range'
    Marty::Util.human_to_pg_range(v)
  when 'integer'
    v.split(ARRSEP).map do |val|
      Integer(val) rescue raise "invalid integer: #{val}"
    end.uniq.sort
  when 'float'
    v.split(ARRSEP).map do |val|
      Float(val) rescue raise "invalid float: #{val}"
    end.uniq.sort
  when 'string'
    res = v.split(ARRSEP).uniq.sort
    raise 'leading/trailing spaces in elements not allowed' if
      res.any? { |x| x != x.strip }
    raise '0-length string not allowed' if res.any?(&:empty?)

    res
  when 'boolean'
    case v.downcase
    when 'true', 't'
      true
    when 'false', 'f'
      false
    else
      raise "bad boolean #{v}"
    end
  else
    # AR class
    # FIXME: won't work if the obj identifier (name) has ARRSEP
    res = v.split(ARRSEP).uniq
    res.each do |k|
      begin
        # check to see if class instance actually exists
        Marty::DataGrid.
          find_class_instance(pt, klass, k) || raise(NoMethodError)
      rescue NoMethodError
        raise "instance #{k} of #{type} not found"
      end
    end
    res
  end
end

.parse_keys(pt, keys, type) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 472

def self.parse_keys(pt, keys, type)
  klass = maybe_get_klass(type)

  keys.map do |v|
    parse_fvalue(pt, v, type, klass)
  end
end

.parse_nots(_pt, keys) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 480

def self.parse_nots(_pt, keys)
  keys.map do |v|
    next false unless v

    v.starts_with?(NOT_STRING_START) && v.ends_with?(NOT_STRING_END)
  end
end

.plpg_lookup_grid_distinct(h_passed, dgh, ret_grid_data = false, distinct = true) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 187

def self.plpg_lookup_grid_distinct(h_passed, dgh, ret_grid_data = false,
                                   distinct = true)
  cd = dgh['created_dt']
  @@dtcache ||= {}
  @@dtcache[cd] ||= cd.strftime(PLV_DT_FMT)
  row_info = {
    'id'         => dgh['id'],
    'group_id'   => dgh['group_id'],
    'created_dt' => @@dtcache[cd]
  }

  h = dgh['metadata'].each_with_object({}) do |m, h|
    attr = m['attr']
    inc = h_passed.fetch(attr, :__nf__)
    next if inc == :__nf__

    val = (defined? inc.name) ? inc.name : inc
    h[attr] = val.is_a?(String) ?
                ActiveRecord::Base.connection.quote(val)[1..-2] : val
  end

  fn     = 'lookup_grid_distinct'
  hjson  = "'#{h.to_json}'::JSONB"
  rijson = "'#{row_info.to_json}'::JSONB"
  params = "#{hjson}, #{rijson}, #{ret_grid_data}, #{distinct}"
  sql    = "SELECT #{fn}(#{params})"
  raw    = ActiveRecord::Base.connection.execute(sql)[0][fn]
  res    = JSON.parse(raw)

  if res['error']
    msg = res['error']
    parms, sqls, ress, dg = res['error_extra'].values_at(
      'params', 'sql', 'results', 'dg')

    raise "DG #{name}: Error in PLPG call: #{msg}\n"\
          "params: #{parms}\n"\
          "sqls: #{sqls}\n"\
          "results: #{ress}\n"\
          "dg: #{dg}\n"\
          "ri: #{row_info}" if res['error']
  end

  res
end

.register_rule_handler(handler) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 133

def self.register_rule_handler(handler)
  (@@rule_handlers ||= []) << handler
end

.type_to_index(type) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 162

def self.type_to_index(type)
  # map given header type to an index class -- uses string index
  # for ruby classes.
  return INDEX_MAP[type] if INDEX_MAP[type]

  INDEX_MAP['string'] if (type.constantize rescue nil)
end

Instance Method Details

#build_index ⇒ Object

FIXME: should be private



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# File 'app/models/marty/data_grid.rb', line 656

def build_index
  # create indices for the metadata
  metadata.each do |inf|
    attr = inf['attr']
    type = inf['type']
    keys = inf['keys']
    nots = inf.fetch('nots', [])

    # find index class
    idx_class = Marty::DataGrid.type_to_index(type)

    keys.each_with_index do |k, index|
      gi              = idx_class.new
      gi.attr         = attr
      gi.key          = k
      gi.created_dt   = created_dt
      gi.data_grid_id = group_id
      gi.index        = index
      gi.not          = nots[index] || false
      gi.save!
    end
  end
end

#dir_infos(dir) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 317

def dir_infos(dir)
  metadata.select { |inf| inf['dir'] == dir }
end

#export ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 399

def export
   # return null string when called from Netzke on add_in_form
   return '' if metadata.nil? && data.nil?

   meta_rows, h_key_rows, data_rows = export_array

   Marty::DataExporter.
     to_csv(meta_rows + [[]] + h_key_rows + data_rows,
            'col_sep' => "\t",
           ).
     gsub(/\"\"/, '') # remove "" to beautify output
end

#export=(text) ⇒ Object

FIXME: this is only here to appease Netzke add_in_form



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# File 'app/models/marty/data_grid.rb', line 359

def export=(text)
end

#export_array ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 362

def export_array
  # add data type metadata row if not default
  lenstr = 'lenient' if lenient

  typestr = data_type unless [nil, DEFAULT_DATA_TYPE].member?(data_type)
  len_type = [lenstr, typestr].compact.join(' ')

  meta_rows = if (lenient || typestr) && constraint
                [[len_type, constraint]]
              elsif lenient || typestr
                [[len_type]]
              elsif constraint
                [['', constraint]]
              else
                []
              end

  meta_rows += metadata.map do |inf|
    [inf['attr'], inf['type'], inf['dir'], inf['rs_keep'] || '']
  end

  v_infos, h_infos = dir_infos('v'), dir_infos('h')

  h_key_rows = h_infos.map do |inf|
    [nil] * v_infos.count + self.class.export_keys(inf)
  end

  transposed_v_keys = v_infos.empty? ? [[]] :
    v_infos.map { |inf| self.class.export_keys(inf) }.transpose

  data_rows = transposed_v_keys.each_with_index.map do |keys, i|
    keys + (data[i] || [])
  end

  [meta_rows, h_key_rows, data_rows]
end

#freeze ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 126

def freeze
  # FIXME: mcfly lookups freeze their results in order to protect
  # the cache.  That doesn't interact correctly with lazy_load which
  # modifies the attr hash at runtime.
  self
end

#save ⇒ Object

FIXME: hacky – save is just save!



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# File 'app/models/marty/data_grid.rb', line 158

def save
  save!
end

#save! ⇒ Object

FIXME: not sure what’s the right way to perform the save in a transaction – i.e. together with build_index. before_save would be OK, but then save inside it would cause an infinite loop.



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# File 'app/models/marty/data_grid.rb', line 144

def save!
  if changed?
    transaction do
      nc, nw, n = [name_changed?, name_was, name]
      res = super
      update_rules(nw, n) if nc && nw.present?
      reload
      build_index
      res
    end
  end
end

#to_s ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 122

def to_s
  name
end

#update_from_import(name, import_text, created_dt = nil) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 635

def update_from_import(name, import_text, created_dt = nil)
  parsed_result = self.class.parse(created_dt, import_text, {})

  new_metadata = parsed_result[:metadata]
  data = parsed_result[:data]
  data_type = parsed_result[:data_type]
  lenient = parsed_result[:lenient]
  constraint = parsed_result[:constraint]

  self.name       = name
  self.data       = data
  self.data_type  = data_type
  self.lenient    = !!lenient
  # Otherwise changed will depend on order in hashes
  self.metadata   = new_metadata unless metadata == new_metadata
  self.constraint = constraint
  self.created_dt = created_dt if created_dt
  save!
end

#update_rules(old, new) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 137

def update_rules(old, new)
  @@rule_handlers.each { |rh| rh.call(old, new) }
end