Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
Tree: f38b544442
Fetching contributors…

Cannot retrieve contributors at this time

73 lines (64 sloc) 2.572 kB
require 'active_support/core_ext/hash/except'
require 'active_support/core_ext/hash/slice'
require 'active_record/relation/merger'
module ActiveRecord
module SpawnMethods
# This is overridden by Associations::CollectionProxy
def spawn #:nodoc:
clone
end
# Merges in the conditions from <tt>other</tt>, if <tt>other</tt> is an <tt>ActiveRecord::Relation</tt>.
# Returns an array representing the intersection of the resulting records with <tt>other</tt>, if <tt>other</tt> 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.
def merge(other)
if other.is_a?(Array)
to_a & other
elsif other
spawn.merge!(other)
else
self
end
end
def merge!(other) # :nodoc:
if !other.is_a?(Relation) && other.respond_to?(:to_proc)
instance_exec(&other)
else
klass = other.is_a?(Hash) ? Relation::HashMerger : Relation::Merger
klass.new(self, other).merge
end
end
# 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
def except(*skips)
relation_with values.except(*skips)
end
# 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
def only(*onlies)
relation_with values.slice(*onlies)
end
private
def relation_with(values) # :nodoc:
result = Relation.create(klass, table, values)
result.extend(*extending_values) if extending_values.any?
result
end
end
end
Jump to Line
Something went wrong with that request. Please try again.