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require 'active_support/core_ext/object/blank'
module ActiveRecord
module SpawnMethods
def merge(r)
return self unless r
return to_a & r if r.is_a?(Array)
merged_relation = clone
r = r.with_default_scope if r.default_scoped? && r.klass != klass
Relation::ASSOCIATION_METHODS.each do |method|
value = r.send(:"#{method}_values")
unless value.empty?
if method == :includes
merged_relation = merged_relation.includes(value)
else
merged_relation.send(:"#{method}_values=", value)
end
end
end
(Relation::MULTI_VALUE_METHODS - [:joins, :where, :order, :binds]).each do |method|
value = r.send(:"#{method}_values")
next if value.empty?
value += merged_relation.send(:"#{method}_values")
merged_relation.send :"#{method}_values=", value
end
merged_relation.joins_values += r.joins_values
merged_wheres = @where_values + r.where_values
merged_binds = (@bind_values + r.bind_values).uniq(&:first)
unless @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_relation.where_values = merged_wheres
merged_relation.bind_values = merged_binds
(Relation::SINGLE_VALUE_METHODS - [:lock, :create_with, :reordering]).each do |method|
value = r.send(:"#{method}_value")
merged_relation.send(:"#{method}_value=", value) unless value.nil?
end
merged_relation.lock_value = r.lock_value unless merged_relation.lock_value
merged_relation = merged_relation.create_with(r.create_with_value) unless r.create_with_value.empty?
if (r.reordering_value)
# override any order specified in the original relation
merged_relation.reordering_value = true
merged_relation.order_values = r.order_values
else
# merge in order_values from r
merged_relation.order_values += r.order_values
end
# Apply scope extension modules
merged_relation.send :apply_modules, r.extensions
merged_relation
end
# Removes from the query the condition(s) specified in +skips+.
#
# Example:
#
# 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)
result = self.class.new(@klass, table)
result.default_scoped = default_scoped
((Relation::ASSOCIATION_METHODS + Relation::MULTI_VALUE_METHODS) - skips).each do |method|
result.send(:"#{method}_values=", send(:"#{method}_values"))
end
(Relation::SINGLE_VALUE_METHODS - skips).each do |method|
result.send(:"#{method}_value=", send(:"#{method}_value"))
end
# Apply scope extension modules
result.send(:apply_modules, extensions)
result
end
# Removes any condition from the query other than the one(s) specified in +onlies+.
#
# Example:
#
# Post.order('id asc').only(:where) # discards the order condition
# Post.order('id asc').only(:where, :order) # uses the specified order
#
def only(*onlies)
result = self.class.new(@klass, table)
result.default_scoped = default_scoped
((Relation::ASSOCIATION_METHODS + Relation::MULTI_VALUE_METHODS) & onlies).each do |method|
result.send(:"#{method}_values=", send(:"#{method}_values"))
end
(Relation::SINGLE_VALUE_METHODS & onlies).each do |method|
result.send(:"#{method}_value=", send(:"#{method}_value"))
end
# Apply scope extension modules
result.send(:apply_modules, extensions)
result
end
end
end
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