Class: Rasti::DB::Relations::ManyToOne

Inherits:
Base
  • Object
show all
Defined in:
lib/rasti/db/relations.rb

Instance Attribute Summary

Attributes inherited from Base

#name, #source_collection_class

Instance Method Summary collapse

Methods inherited from Base

#initialize, #many_to_many?, #many_to_one?, #one_to_many?, #target_collection_class

Constructor Details

This class inherits a constructor from Rasti::DB::Relations::Base

Instance Method Details

#foreign_key ⇒ Object 



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# File 'lib/rasti/db/relations.rb', line 90

def foreign_key
  @foreign_key ||= @options[:foreign_key] || target_collection_class.implicit_foreign_key_name
end

#graph_to(rows, db, schema = nil, relations = []) ⇒ Object 



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# File 'lib/rasti/db/relations.rb', line 94

def graph_to(rows, db, schema=nil, relations=[])
  fks = rows.map { |row| row[foreign_key] }.uniq

  target_collection = target_collection_class.new db, schema

  relation_rows = target_collection.where(source_collection_class.primary_key => fks)
                                   .graph(*relations)
                                   .each_with_object({}) do |row, hash| 
                                      hash[row.public_send(source_collection_class.primary_key)] = row
                                    end
  
  rows.each do |row| 
    row[name] = relation_rows[row[foreign_key]]
  end
end