Class: Marty::DataGrid

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

Defined Under Namespace

Classes: 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,
}
ARRSEP = 
'|'
PLV_DT_FMT = 
"%Y-%m-%d %H:%M:%S.%N6"

Constants inherited from ActiveRecord::Base

ActiveRecord::Base::COUNT_SIG, ActiveRecord::Base::DISTINCT_SIG, ActiveRecord::Base::FIND_BY_SIG, ActiveRecord::Base::FIRST_SIG, ActiveRecord::Base::GROUP_SIG, ActiveRecord::Base::JOINS_SIG, ActiveRecord::Base::LAST_SIG, ActiveRecord::Base::LIMIT_SIG, ActiveRecord::Base::MCFLY_PT_SIG, ActiveRecord::Base::NOT_SIG, ActiveRecord::Base::ORDER_SIG, ActiveRecord::Base::PLUCK_SIG, ActiveRecord::Base::SELECT_SIG, ActiveRecord::Base::WHERE_SIG

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 171

def self.clear_dtcache
  @@dtcache = {}
end

.convert_data_type(data_type) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 160

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 574

def self.create_from_import(name, import_text, created_dt=nil)
  metadata, data, data_type, lenient = parse(created_dt, import_text, {})
  dg            = self.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.save!
  dg
end

.export_keys(inf) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 315

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

  type = inf["type"]
  klass = type.constantize unless INDEX_MAP[type]

  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
end

.get_struct_attrs ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 110

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 263

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 = plv_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 =  case
           when Marty::PgEnum === res
             c_data_type.find_by_name(res)
           when 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 444

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

.modify_grid(params, metadata, data) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 625

def self.modify_grid(params, metadata, data)
  removes = ["h", "v"].each_with_object({}) {|dir, hash| hash[dir] = Set.new}

  metadata_copy, data_copy = metadata.deep_dup, data.deep_dup

  metadata_copy.each do |meta|
    dir, keys, type, rs_keep = meta.values_at(
                       "dir", "keys", "type", "rs_keep")
    next unless rs_keep

    if type == "numrange" || type == "int4range"
      modop, modvalparm = parse_bounds(rs_keep)
      modval = params[modvalparm]
      if modval
        prune_a, rewrite_a = compute_numeric_mods(keys, modop, modval)
        removes[dir].merge(prune_a)
        rewrite_a.each { |(ind, value)| keys[ind] = value }
      end
    else
      modval = params[rs_keep]
      if modval
        prune_a, rewrite_a = compute_set_mods(keys, modval)
        removes[dir].merge(prune_a)
        rewrite_a.each { |(ind, value)| keys[ind] = value }
      end
    end
  end

  removes.reject! { |dir, set| set.empty? }

  removes.each do
    |dir, set|
    metadata_copy.select { |m| m["dir"] == dir }.each do |meta|
      meta["keys"] = remove_indices(meta["keys"], removes[dir])
    end
  end

  data_copy = remove_indices(data_copy, removes["v"]) if removes["v"]

  data_copy.each_index do |index|
    data_copy[index] = remove_indices(data_copy[index], removes["h"])
  end if removes["h"]

  [data_copy, metadata_copy]
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 461

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, *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

  metadata = rows[(data_type || lenient ? 1 : 0)...blank_index].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)

    res = {
      "attr" => attr,
      "type" => type,
      "dir"  => dir,
      "keys" => key && parse_keys(pt, [key], type),
    }
    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"])
  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"])
  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|
        Marty::DataConversion.convert(v, tsym) if v
      end
    end
  else
    data = data_rows.map do
      |r|
      r[v_infos.count, r.count].map do
        |v|
        next v if !v || Marty::DataGrid.
                       find_class_instance(pt, c_data_type, v)

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

  [metadata, data, data_type, lenient]
end

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



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# File 'app/models/marty/data_grid.rb', line 397

def self.parse_fvalue(pt, v, type, klass)
  return unless 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 452

def self.parse_keys(pt, keys, type)
  klass = maybe_get_klass(type)
  keys.map do
    |v|
    parse_fvalue(pt, v, type, klass)
  end
end

.plv_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 177

def self.plv_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 PLV8 call: #{msg}\n"\
          "params: #{parms}\n"\
          "sqls: #{sqls}\n"\
          "results: #{ress}\n"\
          "dg: #{dg}\n"\
          "ri: #{row_info}" if res["error"]
  end

  if ret_grid_data
    dg = find(dgh["id"])
    md, mmd = modify_grid(h_passed, dg.metadata, dg.data)
    res["data"] = md
    res["metadata"] = mmd
  end
  res
end

.register_rule_handler(handler) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 125

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 153

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 601

def build_index
  # create indices for the metadata
  metadata.each do
    |inf|

    attr, type, keys = inf["attr"], inf["type"], inf["keys"]

    # 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.save!
    end
  end
end

#dir_infos(dir) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 311

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 378

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 348

def export=(text)
end

#export_array ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 351

def export_array
  # add data type metadata row if not default
  dt_row = lenient ? ["lenient"] : []
  dt_row << data_type unless [nil, DEFAULT_DATA_TYPE].member?(data_type)

  meta_rows = dt_row.empty? ? [] : [[dt_row.join(' ')]]

  meta_rows += metadata.map { |inf|
    [inf["attr"], inf["type"], inf["dir"], inf["rs_keep"] || ""]
  }

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

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

  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 { |keys, i|
    keys + (self.data[i] || [])
  }

  [meta_rows, h_key_rows, data_rows]
end

#freeze ⇒ Object 



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

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 149

def save
  self.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 135

def save!
  if self.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 114

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 587

def update_from_import(name, import_text, created_dt=nil)
  metadata, data, data_type, lenient =
                             self.class.parse(created_dt, import_text, {})

  self.name       = name
  self.data       = data
  self.data_type  = data_type
  self.lenient    = !!lenient
  self.metadata   = metadata unless self.metadata == metadata # Otherwise changed will depend on order in hashes
  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 128

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