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# File 'lib/relation_to_struct/active_record_relation_extension.rb', line 4
def to_structs(struct_class)
raise ArgumentError, 'Expected select_values to be present' unless self.select_values.present?
relation = spawn
result = klass.connection.select_all(relation.arel, nil, relation.arel.bind_values + bind_values)
if result.columns.size != struct_class.members.size
raise ArgumentError, 'Expected struct fields and columns lengths to be equal'
end
if result.columns.size != result.columns.uniq.size
raise ArgumentError, 'Expected column names to be unique'
end
values_after_casting = ActiveRecord::VERSION::MAJOR >= 5 ? result.cast_values() : result.cast_values(klass.column_types)
if result.columns.size == 1
values_after_casting.map do |tuple|
struct_class.new(tuple)
end
else
values_after_casting.map do |tuple|
struct_class.new(*tuple)
end
end
end
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