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module ActiveRecord
class Relation
class Merger
attr_reader :relation, :other
def initialize(relation, other)
@relation = relation
if other.default_scoped? && other.klass != relation.klass
@other = other.with_default_scope
else
@other = other
end
end
def merge
Relation::ASSOCIATION_METHODS.each do |method|
value = other.send(:"#{method}_values")
unless value.empty?
relation.send("#{method}!", value)
end
end
(Relation::MULTI_VALUE_METHODS - [:joins, :where, :order, :binds]).each do |method|
value = other.send(:"#{method}_values")
next if value.empty?
value += relation.send(:"#{method}_values")
relation.send :"#{method}_values=", value
end
relation.joins_values += other.joins_values
merged_wheres = relation.where_values + other.where_values
merged_binds = (relation.bind_values + other.bind_values).uniq(&:first)
unless relation.where_values.empty?
# Remove duplicates, last one wins.
seen = Hash.new { |h,table| h[table] = {} }
merged_wheres = merged_wheres.reverse.reject { |w|
nuke = false
if w.respond_to?(:operator) && w.operator == :==
name = w.left.name
table = w.left.relation.name
nuke = seen[table][name]
seen[table][name] = true
end
nuke
}.reverse
end
relation.where_values = merged_wheres
relation.bind_values = merged_binds
(Relation::SINGLE_VALUE_METHODS - [:lock, :create_with, :reordering]).each do |method|
value = other.send(:"#{method}_value")
relation.send(:"#{method}_value=", value) unless value.nil?
end
relation.lock_value = other.lock_value unless relation.lock_value
unless other.create_with_value.empty?
relation.create_with_value = (relation.create_with_value || {}).merge(other.create_with_value)
end
if other.reordering_value
# override any order specified in the original relation
relation.reordering_value = true
relation.order_values = other.order_values
else
# merge in order_values from r
relation.order_values += other.order_values
end
# Apply scope extension modules
relation.send :apply_modules, other.extensions
relation
end
end
end
end
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