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module ActiveRecord
module SpawnMethods
def spawn(arel_table = self.table)
relation = Relation.new(@klass, arel_table)
(Relation::ASSOCIATION_METHODS + Relation::MULTI_VALUE_METHODS).each do |query_method|
relation.send(:"#{query_method}_values=", send(:"#{query_method}_values"))
end
Relation::SINGLE_VALUE_METHODS.each do |query_method|
relation.send(:"#{query_method}_value=", send(:"#{query_method}_value"))
end
relation
end
def merge(r)
raise ArgumentError, "Cannot merge a #{r.klass.name} relation with #{@klass.name} relation" if r.klass != @klass
merged_relation = spawn.eager_load(r.eager_load_values).preload(r.preload_values).includes(r.includes_values)
merged_relation.readonly_value = r.readonly_value unless merged_relation.readonly_value
merged_relation.limit_value = r.limit_value unless merged_relation.limit_value
merged_relation.lock_value = r.lock_value unless merged_relation.lock_value
merged_relation = merged_relation.
joins(r.joins_values).
group(r.group_values).
offset(r.offset_value).
select(r.select_values).
from(r.from_value).
having(r.having_values)
relation_order = r.order_values
merged_order = relation_order.present? ? relation_order : order_values
merged_relation.order_values = merged_order
merged_relation.create_with_value = @create_with_value
if @create_with_value && r.create_with_value
merged_relation.create_with_value = @create_with_value.merge(r.create_with_value)
else
merged_relation.create_with_value = r.create_with_value || @create_with_value
end
merged_wheres = @where_values
r.where_values.each do |w|
if w.is_a?(Arel::Predicates::Equality)
merged_wheres = merged_wheres.reject {|p| p.is_a?(Arel::Predicates::Equality) && p.operand1.name == w.operand1.name }
end
merged_wheres << w
end
merged_relation.where_values = merged_wheres
merged_relation
end
alias :& :merge
def except(*skips)
result = Relation.new(@klass, table)
(Relation::ASSOCIATION_METHODS + Relation::MULTI_VALUE_METHODS).each do |method|
result.send(:"#{method}_values=", send(:"#{method}_values")) unless skips.include?(method)
end
Relation::SINGLE_VALUE_METHODS.each do |method|
result.send(:"#{method}_value=", send(:"#{method}_value")) unless skips.include?(method)
end
result
end
end
end
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