如何对多维对象使用Redux操作?

我有一个简单的动作来设置n1维的状态 我的状态对象和减速机如下所示

    const F2F = {
        openF2F: false,
        ...
    }

    const initialState = {
        showModal: false,
        F2F,
        ...
    }

export default function reducer(state=initialState, action) {
    switch (action.type) {

        case psActions.ON_CHANGE:
            return {
                ...state,
                [action.fieldName]: action.value
            }

        default:
            return state
  }
}

我有一个问题,如何使一个动作指向状态对象

export function onChangeDim(value, name, dimension) {
    return {
        type:      psActions.ON_CHANGE,
        fieldName: dimension[name],//Tried many things her
        value:     value
    }
}

使现代化

case psActions.ON_CHANGE_DIM:
    return {
        ...state,
        [action.dimension]: {
            [action.fieldName]:action.value
        }
    }

有人能帮我吗?