<aura:component implements="force:hasRecordId,lightning:actionOverride" access="global">

    <aura:registerEvent name="customEvent" type="c:customEvent"/>

    <lightning:recordEditForm objectApiName="MyObject__c"
            onload="{!c.handleLoad}" onsubmit="{!c.handleSubmit}" onsuccess="{!c.handleSuccess}" onerror="{!c.handleError}">
        <lightning:messages />
        <div class="slds-p-around_small">
            <lightning:inputField fieldName="Name"/>
            <lightning:inputField fieldName="Field1__c"/>
            <lightning:inputField fieldName="Field2__c"/>
            <lightning:inputField fieldName="MasterDetail__c" value="{!v.recordId}"/>
            <div class="slds-m-top_medium">
                <lightning:button variant="brand" type="submit" name="save" label="Save" />
            </div>
        </div>
    </lightning:recordEditForm>

</aura:component>

handleLoad : function(component, event, helper) {

},

handleSubmit: function(component, event, helper) {

},

handleSuccess: function(component, event, helper) {
    var fireEvent = $A.get("e.c:customEvent");
    fireEvent.fire();
},

handleError: function(component, event, helper, error){
}