Module: Hayfork::Join

Included in:
Hayfork
Defined in:
lib/hayfork/join.rb

Instance Method Summary collapse

Instance Method Details

#join(relation, join_value) ⇒ Object 



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# File 'lib/hayfork/join.rb', line 4

def join(relation, join_value)
  case join_value
  when String
    relation.joins(join_value)

  when Symbol
    reflection = reflection_for(relation.model, join_value)
    case reflection.macro
    when :has_many, :has_and_belongs_to_many
      relation.left_outer_joins(join_value).where(reflection.klass.arel_table[:id].not_eq(nil))
    when :belongs_to, :has_one
      relation.joins(join_value)
    else
      fail NotImplementedError, "Joins haven't been implemented for #{reflection.macro.inspect} associations"
    end

  else
    fail NotImplementedError, "Statement#joins does not yet accept #{join_value.class} params like #{join_value.inspect}. Will this scenario work with `has_many through:` or `has_one through:`?"
  end
end

#reflection_for(model, association) ⇒ Object 



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# File 'lib/hayfork/join.rb', line 25

def reflection_for(model, association)
  reflection = model.reflect_on_association(association)
  fail AssociationNotFoundError, "Association ':#{association}' not found on '#{model}'" unless reflection
  reflection
end