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module Arel
class InsertManager < Arel::TreeManager
def initialize engine
super
@head = Nodes::InsertStatement.new
end
def into table
@head.relation = table
self
end
def columns; @head.columns end
def values= val; @head.values = val; end
def insert fields
return if fields.empty?
if String === fields
@head.values = SqlLiteral.new(fields)
else
@head.relation ||= fields.first.first.relation
values = []
fields.each do |column, value|
@head.columns << column
values << value
end
@head.values = Nodes::Values.new values
end
end
end
end
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