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require 'active_fedora/relation/merger'
module ActiveFedora
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
end
end
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83 entries across 83 versions & 1 rubygems