Class: Masterman::Relation

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Includes:
Enumerable
Defined in:
lib/masterman/relation.rb

Instance Method Summary collapse

Constructor Details

#initialize(klass, records = []) ⇒ Relation

Returns a new instance of Relation.



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# File 'lib/masterman/relation.rb', line 13

def initialize(klass, records = [])
  @klass = klass
  @instances = to_instances(records)
end

Instance Method Details

#all ⇒ Object 



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# File 'lib/masterman/relation.rb', line 48

def all
  to_a
end

#find(id) ⇒ Object 



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# File 'lib/masterman/relation.rb', line 18

def find(id)
  @instances[id] || raise(RecordNotFound.new('missing record'))
end

#find_by(attributes) ⇒ Object 



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# File 'lib/masterman/relation.rb', line 22

def find_by(attributes)
  @instances.each do |_, record|
    return record if attributes.all? { |key, value| record[key] == value }
  end

  nil
end

#ids ⇒ Object 



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# File 'lib/masterman/relation.rb', line 40

def ids
  pluck(@klass.masterman.primary_key)
end

#many? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/masterman/relation.rb', line 44

def many?
  count > 1
end

#pluck(*column_names) ⇒ Object 



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# File 'lib/masterman/relation.rb', line 30

def pluck(*column_names)
  if column_names.one?
    all.map { |record| record[column_names.first] }
  else
    all.map do |record|
      column_names.map { |name| record[name] }
    end
  end
end

#to_a ⇒ Object 



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# File 'lib/masterman/relation.rb', line 52

def to_a
  @instances.values
end