Hot to make a dynamic lightning:inputfield required

Question

I have a fieldset which I get from serverside and load on clientside I am adding the required parameter to the field but my component does not alert on required. I added the values behind the fields and these have the correct value. What am I missing?

<aura:iteration items="{!v.fields}" var="field" >
            <aura:if isTrue="{!v.inputModeBool == true? true: false}">
                <lightning:inputField fieldName="{!field.fieldPath}"  required="{!field.required}"/>{!field.required}
            </aura:if>
            <aura:if isTrue="{!v.inputModeBool != true? true: false}">
                <lightning:layout >
                    <lightning:layoutitem size="10">
                        <lightning:outputField fieldName="{!field.fieldPath}"/>
                    </lightning:layoutitem>
                    <lightning:layoutitem size="2">
                        <lightning:buttonIcon iconName="utility:edit" variant="bare"
                                              alternativeText="edit"
                                              onclick="{!c.handleToggle}"/>
                    </lightning:layoutitem>
                </lightning:layout>
            </aura:if>
        </aura:iteration>

Answer 1

The specification of lightning:inputField does not specify required as an attribute. The documentation tab mentions the following:

To persist requiredness on a field, select the Required checkbox when defining the custom field in Setup. A required field is displayed with a red asterisk next to the field label. An error message is displayed below a required field if you try to submit the form before entering a value.

So it seems, in order to use the lightning:inputField component, either the field has to be required at the schema level or you would have to implement the validation in your javascript controller.