Looping over a SolutionArray does not include extra items

[bryanwweber]

Problem description

Accessing extra items from a SolutionArray in a loop gives an AttributeError.

Steps to reproduce

import cantera as ct
import numpy as np
gas = ct.Solution("gri30.yaml")

T = np.arange(900, 1000, 50)
estimated_ignition_delay_times = np.ones_like(T) * 0.005
ignition_delays = ct.SolutionArray(gas, shape=T.shape, extra={"tau": estimated_ignition_delay_times})
ignition_delays.TP = T, 40.0 * 101325.0
for state in ignition_delays:
    print(state._extra)

Output:

OrderedDict()
...

Behavior

Looping should include the extra information.

System information

• Cantera version: main, 041559d

[bryanwweber]

Hmm, similarly, accessing a single row of the SolutionArray also does not include the extra information:

>>> ignition_delays[0]._extra
Ordered_Dict()

[ischoegl]

@bryanwweber ... I can reproduce this. As ignition_delays[0] returns a SolutionArray, the _extra property should be propagated.