Module: ROM::SQL::Relation::Associations

Defined in:
lib/rom/fmp/relation/associations.rb

Instance Method Summary collapse

Instance Method Details

#association_join(name, options = {}) ⇒ Object

Join configured association.

Uses INNER JOIN type.

Examples:


setup.relation(:tasks)

setup.relations(:users) do
  one_to_many :tasks, key: :user_id

  def with_tasks
    association_join(:tasks, select: [:title])
  end
end


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# File 'lib/rom/fmp/relation/associations.rb', line 22

def association_join(name, options = {})
  graph_join(name, :inner, options)
end

#association_left_join(name, options = {}) ⇒ Object

Join configured association

Uses LEFT JOIN type.

Examples:


setup.relation(:tasks)

setup.relations(:users) do
  one_to_many :tasks, key: :user_id

  def with_tasks
    association_left_join(:tasks, select: [:title])
  end
end


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# File 'lib/rom/fmp/relation/associations.rb', line 43

def association_left_join(name, options = {})
  graph_join(name, :left_outer, options)
end

#graph(*args) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/rom/fmp/relation/associations.rb', line 63

def graph(*args)
  __new__(dataset.__send__(__method__, *args))
end

#graph_join(name, join_type, options = {}) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/rom/fmp/relation/associations.rb', line 48

def graph_join(name, join_type, options = {})
  assoc = model.association_reflection(name)

  key = assoc[:key]
  type = assoc[:type]

  if type == :many_to_many
    select = options[:select] || {}
    graph_join_many_to_many(name, assoc, select)
  else
    graph_join_other(name, key, type, join_type, options)
  end
end