Class: TaliaCore::SemanticRelation

Inherits:
ActiveRecord::Base
  • Object
show all
Defined in:
lib/talia_core/semantic_relation.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.fat_record_select ⇒ Object

For selecting “fat” records on the semantic properties



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# File 'lib/talia_core/semantic_relation.rb', line 40

def fat_record_select
  @select ||= begin
    select = 'semantic_relations.id AS id, semantic_relations.created_at AS created_at, '
    select << 'semantic_relations.updated_at AS updated_at, '
    select << 'semantic_relations.rel_order AS rel_order,'
    select << 'object_id, object_type, subject_id, predicate_uri, '
    select << 'obj_props.created_at AS property_created_at, '
    select << 'obj_props.updated_at AS property_updated_at, '
    select << 'obj_props.value AS property_value, '
    select << 'obj_sources.created_at AS object_created_at, '
    select << 'obj_sources.updated_at AS object_updated_at, obj_sources.type AS  object_realtype, '
    select << 'obj_sources.uri AS object_uri'
    select
  end
end

.find_fat_relations(source, predicate) ⇒ Object

Retrieve “fat” relations for the given source and property



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# File 'lib/talia_core/semantic_relation.rb', line 26

def find_fat_relations(source, predicate)
  joins = ActiveSource.sources_join
  joins << ActiveSource.props_join
  relations = SemanticRelation.find(:all, :conditions => {
      :subject_id => source.id,
      :predicate_uri => predicate
    },
    :joins => joins,
    :select => fat_record_select
  )
  relations
end

Instance Method Details

#matches?(predicate, value = nil) ⇒ Boolean

Returns true if the Relation matches the given predicate URI (and value, if given)

Returns:

  • (Boolean) 


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# File 'lib/talia_core/semantic_relation.rb', line 10

def matches?(predicate, value = nil)
  if(value)
    if(value.is_a?(ActiveSource) || value.is_a?(SemanticProperty))
      (predicate_uri == predicate.to_s) && (value == object)
    else
      return false unless(object.is_a?(SemanticProperty))
      (predicate_uri == predicate.to_s) && (object.value == value)
    end
  else
    predicate_uri == predicate.to_s
  end
end