Class: ConceptQL::Operators::CastingOperator

Inherits:
Operator
  • Object
show all
Defined in:
lib/conceptql/operators/casting_operator.rb

Overview

Parent class of all casting operators

Subclasses must implement the following methods:

  • my_domain

  • i_point_at

  • these_point_at_me

i_point_at returns a list of domains for which the operator’s table of origin has foreign_keys pointing to another table, e.g.: procedure_occurrence has an FK to visit_occurrence, so we’d put :visit_occurrence in the i_point_at array

these_point_at_me is a list of domains for which that domain’s table of origin has a FK pointing to the current operator’s table of origin, e.g.: procedure_cost has an FK to procedure_occurrence so we’d put :procedure_cost in procedure_occurrence’s these_point_at_me array

Also, if a casting operator is passed no streams, it will return all the rows in its table as results.

Instance Attribute Summary

Attributes inherited from Operator

#arguments, #errors, #nodifier, #options, #upstreams, #values

Instance Method Summary collapse

Methods inherited from Operator

#annotate, #cast_column, #code_list, codes_should_match, #columns, #create_upstreams, #data_model, #database_type, default_query_columns, #dup_values, #dynamic_columns, #evaluate, inherited, #initialize, #inspect, #label, new, #operator_name, #optimized, query_columns, register, require_column, #required_columns, #scope, #select_it, #setup_select, #sql, #stream, #to_op, #unionable?, #upstreams_valid?, #valid?

Methods included from Metadatable

#allows_many_upstreams, #allows_one_upstream, #argument, #auto_label, #basic_type, #category, #derive_metadata_from_validations, #desc, #get_desc, #humanized_class_name, #inherited, #just_class_name, #no_desc, #option, #predominant_domains, #pref_name, #preferred_name, #reset_categories, #standard_description, #to_metadata, #validate_at_least_one_upstream_to_metadata, #validate_at_most_one_upstream_to_metadata, #validate_no_arguments_to_metadata, #validate_no_upstreams_to_metadata, #validate_one_upstream_to_metadata, #validate_required_options_to_metadata, #warn_about_missing_metadata

Constructor Details

This class inherits a constructor from ConceptQL::Operators::Operator

Instance Method Details

#castables ⇒ Object 



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# File 'lib/conceptql/operators/casting_operator.rb', line 39

def castables
  (i_point_at + these_point_at_me)
end

#domain ⇒ Object 



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# File 'lib/conceptql/operators/casting_operator.rb', line 35

def domain
  my_domain
end

#domains(db) ⇒ Object 



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# File 'lib/conceptql/operators/casting_operator.rb', line 31

def domains(db)
  [domain]
end

#query(db) ⇒ Object 



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# File 'lib/conceptql/operators/casting_operator.rb', line 47

def query(db)
  return db.from(make_table_name(my_domain)) if stream.nil?
  base_query(db, stream.evaluate(db))
end

#query_cols ⇒ Object 



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# File 'lib/conceptql/operators/casting_operator.rb', line 43

def query_cols
  table_columns(make_table_name(my_domain))
end