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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
merge_multi_values
merge_single_values
relation
end
private
def merge_multi_values
values = Relation::ASSOCIATION_METHODS + Relation::MULTI_VALUE_METHODS - [:where, :order, :bind]
values.each do |method|
value = other.send(:"#{method}_values")
unless value.empty?
relation.send("#{method}!", value)
end
end
relation.where_values = merged_wheres
relation.bind_values = merged_binds
if other.reordering_value
# override any order specified in the original relation
relation.reorder! 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
end
def merge_single_values
values = Relation::SINGLE_VALUE_METHODS - [:reverse_order, :lock, :create_with, :reordering]
values.each do |method|
value = other.send(:"#{method}_value")
relation.send("#{method}!", value) if value
end
relation.lock_value = other.lock_value unless relation.lock_value
relation.reverse_order_value = other.reverse_order_value
unless other.create_with_value.empty?
relation.create_with_value = (relation.create_with_value || {}).merge(other.create_with_value)
end
end
def merged_binds
(relation.bind_values + other.bind_values).uniq(&:first)
end
def merged_wheres
merged_wheres = relation.where_values + other.where_values
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
merged_wheres
end
end
end
end
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