Class: ConceptQL::Operators::From

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

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

#domains(db) ⇒ Object 



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# File 'lib/conceptql/operators/from.rb', line 16

def domains(db)
  doms = options[:domains]
  if doms.nil? || doms.empty?
    if TABLE_COLUMNS.has_key?(table)
      [table]
    else
      [:invalid]
    end
  else
    doms.map(&:to_sym)
  end
end

#query(db) ⇒ Object 



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# File 'lib/conceptql/operators/from.rb', line 12

def query(db)
  db.from(table)
end

#query_cols ⇒ Object 



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# File 'lib/conceptql/operators/from.rb', line 33

def query_cols
  cols = options[:query_cols]
  if cols.nil? || cols.empty?
    cols = table_columns(table) rescue dynamic_columns
  end
  cols
end

#table ⇒ Object 



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# File 'lib/conceptql/operators/from.rb', line 29

def table
  values.first.to_sym rescue nil
end