initial values from state of material-ui dropdown in redux-form

I have a material-ui dropdown menu inside a redux-form, and I want to initialize its value. I am getting both the value that I want [exercise.exercise_type_id and exercise.exercise_type_name] and the list of available options [types, array of objects with id and name properties, among others] by dispatching two actions:

componentWillMount(){
    this.props.actions.exercise.fetchInfo(this.props.params.exerciseId);
    this.props.actions.exercise.fetchAllTypes();
};

Ideally I would like to have somewhere something like:

_.map(this.props.types, (type) =>{
            if (type.id == this.props.exercise.exercise_type_id){
                this.setState({
                    dropDownValue: type.name
                });
            }
        }); 

but only for the initial state, since we want to handle changes with handleDropDownChange.

[Of course I would appreciate something like

state = {
    dropDownValue: {this.props.exercise.exercise_type_name}
};

but I know this is an anti-pattern. But anyway it doesn't work, props are still empty.]

My dropdown is like this:

<DropDownMenu {...exercise_type_name} //does nothing
        value={dropDownValue}
        onChange={onDropDownChange}>
    {_.map(types, (type) => {
        return <MenuItem key={type.id} value={type.name} primaryText={type.name}/>;
    })}

More code:

//...

state = {
        dropDownValue: ''
    };

//...

handleDropDownChange = (event, index, value) => {
        this.setState({
            dropDownValue: value
        });
    };

//...

  function mapStateToProps(state){
    return {
        exercise: getExerciseInfo(state),
        initialValues: getExerciseInfo(state),
        request: getExRequest(state),
        types: getExTypes(state)
    };
}

//....

export default reduxForm({
    form: 'EditExerciseForm',
    fields: ['exercise_type_name', 'max_errors_percentage', 'min_speed']
}, mapStateToProps, mapDispatchToProps)(ExerciseEdit);