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Module: ActiveRecord::SpawnMethods

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Included In:
AssociationRelation, Associations::CollectionProxy, Relation
Defined in: activerecord/lib/active_record/relation/spawn_methods.rb

Instance Method Summary

Instance Method Details

#except(*skips)

Removes from the query the condition(s) specified in skips.

Post.order('id asc').except(:order)                  # discards the order condition
Post.where('id > 10').order('id asc').except(:where) # discards the where condition but keeps the order
[ GitHub ] 

  


# File 'activerecord/lib/active_record/relation/spawn_methods.rb', line 56



def except(*skips)
  relation_with values.except(*skips)
end


  








  

    #merge(other)  
  



  

    

Merges in the conditions from other, if other is an Relation. Returns an array representing the intersection of the resulting records with other, if other is an array.



Post.where(published: true).joins(:comments).merge( Comment.where(spam: false) )
# Performs a single join query with both where conditions.

recent_posts = Post.order('created_at DESC').first(5)
Post.where(published: true).merge(recent_posts)
# Returns the intersection of all published posts with the 5 most recently created posts.
# (This is just an example. You'd probably want to do this with a single query!)



Procs will be evaluated by merge:



Post.where(published: true).merge(-> { joins(:comments) })
# => Post.where(published: true).joins(:comments)



This is mainly intended for sharing common conditions between multiple associations.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/relation/spawn_methods.rb', line 30



def merge(other)
  if other.is_a?(Array)
    to_a & other
  elsif other
    spawn.merge!(other)
  else
    self
  end
end


  








  

    #only(*onlies)  
  



  

    

Removes any condition from the query other than the one(s) specified in onlies.



Post.order('id asc').only(:where)         # discards the order condition
Post.order('id asc').only(:where, :order) # uses the specified order


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/relation/spawn_methods.rb', line 64



def only(*onlies)
  if onlies.any? { |o| o == :where }
    onlies << :bind
  end
  relation_with values.slice(*onlies)
end