Class: DwcOccurrence

Inherits:
ApplicationRecord show all
Includes:
Housekeeping
Defined in:
app/models/dwc_occurrence.rb

Overview

A Darwin Core Record for the Occurrence core. Field generated from Ruby dwc-meta, which references the same spec that is used in the IPT, and the Dwc Assistant. Each record references a specific CollectionObject or AssertedDistribution.

Important: This is a cache/index, data here are periodically destroyed and regenerated from multiple tables in TW.

DWC attributes are camelCase to facilitate matching dwcClass is a replacement for the Rails reserved ‘Class’

All DC attributes (attributes not in DwcOccurrence::TW_ATTRIBUTES) in this table are namespaced to dc (“purl.org/dc/terms/”, “rs.tdwg.org/dwc/terms/”)

README:

 There is a two part strategy to building the index. 1) An individual record will rebuild on request with `parameter to collection_objects/123/dwc*?build=true`.
 2) Wipe, and rebuild on some schedule. It would in theory be possible to track and rebuild when a class of every property was created (or updated), however
 this is a lot of overhead to inject/code for a lot of models. It would inject latency at numerous stages that would perhaps impact UI performance.

Notes -

This experiment isn't going to work at scale, too many preceding calls for big returns

after_find :refresh, if: -> { persisted? && is_stale? }

def refresh
  dwc_occurrence_object.set_dwc_occurrence
end

TODO: The basisOfRecord CVTs are not super informative.

We know collection object is definitely 1:1 with PreservedSpecimen, however
AssertedDistribution could be HumanObservation (if source is person), or ... what? if
its a published record.  Seems we need a 'PublishedAssertation', just like we model the data.

Gotchas.

* updated_at is set by touching the record, not via housekeeping.

Constant Summary collapse

DC_NAMESPACE = 
'http://rs.tdwg.org/dwc/terms/'.freeze
TW_ATTRIBUTES =

Not yet implemented, but likely needed (at an even higher level) ? :id

[
  :id,
  :project_id,
  :created_at,
  :updated_at,
  :created_by_id,
  :updated_by_id,
  :dwc_occurrence_object_type,
  :dwc_occurence_object_id
].freeze
HEADER_CONVERTERS = 
{
  'dwcClass' => 'class',
}.freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Housekeeping

#has_polymorphic_relationship?

Methods inherited from ApplicationRecord

transaction_with_retry

Instance Attribute Details

#occurrence_identifier ⇒ Object

Returns the value of attribute occurrence_identifier.



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# File 'app/models/dwc_occurrence.rb', line 81

def occurrence_identifier
  @occurrence_identifier
end

Class Method Details

.annotates? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'app/models/dwc_occurrence.rb', line 97

def self.annotates?
  false
end

.asserted_distributions_join ⇒ ActiveRecord::Relation

that matches, consider moving to Shared

Returns:

  • (ActiveRecord::Relation) 


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# File 'app/models/dwc_occurrence.rb', line 115

def self.asserted_distributions_join
  a = arel_table
  b = ::AssertedDistribution.arel_table
  j = a.join(b).on(a[:dwc_occurrence_object_type].eq('AssertedDistribution').and(a[:dwc_occurrence_object_id].eq(b[:id])))
  joins(j.join_sources)
end

.by_collection_object_filter(filter_scope: nil, project_id: nil) ⇒ Object

Return scopes by a collection object filter



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# File 'app/models/dwc_occurrence.rb', line 158

def self.by_collection_object_filter(filter_scope: nil, project_id: nil)
  return DwcOccurrence.none if project_id.nil? || filter_scope.nil?

  c = ::CollectionObject.arel_table
  d = arel_table

  # TODO: hackish
  k = ::CollectionObject.select('coscope.id').from( '(' + filter_scope.to_sql + ') as coscope ' )

  a = self.collection_objects_join
    .where('dwc_occurrences.project_id = ?', project_id)
    .where(dwc_occurrence_object_id: k)
    .select(::DwcOccurrence.target_columns) # TODO !! Will have to change when AssertedDistribution and other types merge in
  a
end

.collection_objects_join ⇒ ActiveRecord::Relation

that matches, consider moving to Shared

Returns:

  • (ActiveRecord::Relation) 


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# File 'app/models/dwc_occurrence.rb', line 106

def self.collection_objects_join
  a = arel_table
  b = ::CollectionObject.arel_table
  j = a.join(b).on(a[:dwc_occurrence_object_type].eq('CollectionObject').and(a[:dwc_occurrence_object_id].eq(b[:id])))
  joins(j.join_sources)
end

.computed_columns ⇒ Scope

Returns the columns inferred to have data.

Returns:

  • (Scope) —

    the columns inferred to have data



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# File 'app/models/dwc_occurrence.rb', line 210

def self.computed_columns
  select(target_columns)
end

.empty_fields ⇒ Array

Returns of column names as symbols that are blank in ALL projects (not just this one).

Returns:

  • (Array) —

    of column names as symbols that are blank in ALL projects (not just this one)



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# File 'app/models/dwc_occurrence.rb', line 176

def self.empty_fields
  empty_in_all_projects = ActiveRecord::Base.connection.execute("select attname
  from pg_stats
  where tablename = 'dwc_occurrences'
  and most_common_vals is null
  and most_common_freqs is null
  and histogram_bounds is null
  and correlation is null
  and null_frac = 1;").pluck('attname').map(&:to_sym)

  empty_in_all_projects #  - target_columns
end

.excluded_columns ⇒ Array

Returns of symbols.

Returns:

  • (Array) —

    of symbols



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# File 'app/models/dwc_occurrence.rb', line 204

def self.excluded_columns
  ::DwcOccurrence.columns.collect{|c| c.name.to_sym} - (self.target_columns - [:dwc_occurrence_object_id, :dwc_occurrence_object_type])
end

.scoped_by_otu(otu) ⇒ Scope

Returns all DwcOccurrences for the Otu

  • Includes synonymy (coordinate OTUs).

Returns:

  • (Scope) —

    all DwcOccurrences for the Otu

    • Includes synonymy (coordinate OTUs).



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# File 'app/models/dwc_occurrence.rb', line 127

def self.scoped_by_otu(otu)
  a,b = nil, nil

  if otu.taxon_name_id.present?
    a = ::Queries::DwcOccurrence::Filter.new(
      asserted_distribution_query: {
        taxon_name_query: {
          taxon_name_id: otu.taxon_name_id,
          descendants: false, # include self
          synonymify: true } })

    b = ::Queries::DwcOccurrence::Filter.new(
      collection_object_query: {
        taxon_name_query: {
          taxon_name_id: otu.taxon_name_id,
          descendants: false, # include self
          synonymify: true } })
  else
    a = ::Queries::DwcOccurrence::Filter.new(
      asserted_distribution_query: {
        otu_id: otu.id})

    b = ::Queries::DwcOccurrence::Filter.new(
      collection_object_query: {
        otu_query: { otu_id: otu.id}})
  end

  from("((#{a.all.to_sql}) UNION (#{b.all.to_sql})) as dwc_occurrences")
end

.stale(kind = 'CollectionObject') ⇒ Object 



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# File 'app/models/dwc_occurrence.rb', line 91

def self.stale(kind = 'CollectionObject')
  tbl = kind.tableize
  DwcOccurrence.joins("LEFT JOIN #{tbl} tbl on dwc_occurrences.dwc_occurrence_object_id = tbl.id")
  .where("tbl.id IS NULL and dwc_occurrences.dwc_occurrence_object_type = '#{kind}'")
end

.sweep ⇒ Object

Delete all stale indecies, where stale = object is missing



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# File 'app/models/dwc_occurrence.rb', line 84

def self.sweep
  %w{CollectionObject AssertedDistribution}.each do |k|
    stale(k).delete_all
  end
  true
end

.target_columns ⇒ Array

!! TODO: When we come to adding AssertedDistributions, FieldOccurrnces, etc. we will have to make this more flexible

Returns:

  • (Array) —

    of symbols



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# File 'app/models/dwc_occurrence.rb', line 193

def self.target_columns
  [:id, # must be in position 0
   :occurrenceID,
   :basisOfRecord,
   :dwc_occurrence_object_id,   # !! We don't want this, but need it in joins, it is removed in trim via `.excluded_columns` below
   :dwc_occurrence_object_type, # !! ^
  ] + CollectionObject::DwcExtensions::DWC_OCCURRENCE_MAP.keys
end

Instance Method Details

#as_json(options = {}) ⇒ Object

TODO: Consider using more broadly? Strip nils when ‘to_json` used



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# File 'app/models/dwc_occurrence.rb', line 66

def as_json(options = {})
  super(options.merge(except: attributes.keys.select { |key| self[key].nil? }))
end

#basis ⇒ Object 



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# File 'app/models/dwc_occurrence.rb', line 214

def basis
  case dwc_occurrence_object_type
  when 'CollectionObject'
    if dwc_occurrence_object.is_fossil?
      return 'FossilSpecimen'
    else
      return 'PreservedSpecimen'
    end
  when 'AssertedDistribution'
    # Used to fork b/b Source::Human and Source::Bibtex:
    case dwc_occurrence_object.source&.type || dwc_occurrence_object.sources.order(cached_nomenclature_date: :DESC).first.type
    when 'Source::Bibtex'
      return 'MaterialCitation'
    when 'Source::Human'
      return 'HumanObservation'
    else # Not recommended at this point
      return 'Occurrence'
    end
  end
  'Undefined'
end

#create_object_uuid ⇒ Object (protected) 



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# File 'app/models/dwc_occurrence.rb', line 306

def create_object_uuid
  @occurrence_identifier = Identifier::Global::Uuid::TaxonworksDwcOccurrence.create!(
    identifier_object: dwc_occurrence_object,
    by: dwc_occurrence_object&.creator, # revisit, why required?
    project_id: dwc_occurrence_object&.project_id, # Current.project_id,  # revisit, why required?
    is_generated: true)
end

#generate_uuid_if_required(force = false) ⇒ Object

TODO: quick check if occurrenceID exists in table?! <-> locking sync !?

Parameters:

  • force (Boolean) (defaults to: false) —

    true - only create identifier if identifier exists false - check if occurrenceID is present, if it is, assume identifier (still) exists



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# File 'app/models/dwc_occurrence.rb', line 248

def generate_uuid_if_required(force = false)
  if force # really make sure there is an object to work with
    create_object_uuid if !occurrence_identifier && !dwc_occurrence_object.nil? # TODO: can be simplified when inverse_of/validation added to identifiers
  else # assume if occurrenceID is not blank identifier is present
    if occurrenceID.blank?
      create_object_uuid if !occurrence_identifier && !dwc_occurrence_object.nil? # TODO: can be simplified when inverse_of/validation added to identifiers
    end
  end
end

#is_stale? ⇒ Boolean

!! This a spot check, it’s not (yet) coded to be comprehensive. !! You should request a full rebuild (rebuild=true) at display time !! to ensure an up-to-date individual record

Returns:

  • (Boolean) —

    By looking at the data, determine if a related record has been updated since this record ws updated at.



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# File 'app/models/dwc_occurrence.rb', line 266

def is_stale?
  case dwc_occurrence_object_type
  when 'CollectionObject'

    # Checks made on values, not time (necessary to handle lists)
    return true if taxon_determination_is_stale?

    # Order these roughgly by most probable/frequent changes, and/or fewest db calls required
    times = [
      dwc_occurrence_object.updated_at, # Shouldn't be neccessary since on_save rebuilds, but cheap here
      dwc_occurrence_object.collecting_event&.updated_at,
      dwc_occurrence_object.taxon_determinations.order(:position)&.first&.updated_at,
      dwc_occurrence_object.biocuration_classifications.order(:updated_at).first&.updated_at,
      dwc_occurrence_object.georeferences.order(:updated_at).first&.updated_at,
      dwc_occurrence_object.data_attributes.order(:updated_at).first&.updated_at,

      dwc_occurrence_object.collecting_event&.data_attributes&.order(:updated_at)&.first&.updated_at,
    ]

    n = read_attribute(:updated_at) # || Time.current <- if this then never stale!

    times.each do |v|
      next if v.nil?
      return true if v > n
    end

    return false
  else # AssertedDistribution
    dwc_occurrence_object.updated_at > updated_at
  end
end

#set_metadata_attributes ⇒ Object (protected) 



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# File 'app/models/dwc_occurrence.rb', line 314

def set_metadata_attributes
  write_attribute( :basisOfRecord, basis)
  write_attribute( :occurrenceID, occurrence_identifier&.identifier)
end

#taxon_determination_is_stale? ⇒ Boolean

Returns Boolean acts_as_list actions don’t trigger updated_at changes, handle this by comparing current values.

Returns:

  • (Boolean) —

    Boolean acts_as_list actions don’t trigger updated_at changes, handle this by comparing current values



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# File 'app/models/dwc_occurrence.rb', line 300

def taxon_determination_is_stale?
  dwc_occurrence_object&.taxon_determinations.order(:position).first&.otu&.taxon_name&.cached_name_and_author_year != scientificName
end

#uuid_identifier_scope ⇒ Object 



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# File 'app/models/dwc_occurrence.rb', line 236

def uuid_identifier_scope
  dwc_occurrence_object&.identifiers&.where('identifiers.type like ?', 'Identifier::Global::Uuid%')&.order(:position)
end