Assertion Failed on custom object - Lightning component

Question

I have been developing a basic lightning component to return all the names of my custom object "competitor" but am being thrown this error?

Assertion Failed!: Unable to get value for key 'competitor__c.Name'. No value provider was found for 'competitor__c'. : false Failing descriptor: {aura$iteration$controller$itemsChange}

Personally I cant see anything wrong with my approach so if someone else could give me some advice I would really appreciate it.

Thanks

CompetitorListController.apxc

public with sharing class CompetitorListController {

@AuraEnabled
public static List<Competitor__c> findAll() {
    return [SELECT id, name FROM Competitor__c LIMIT 50];
    }

}

CompetitorListController.cmp

<aura:component controller="CompetitorListController">

<aura:attribute name="competitors__c" type="competitor__c[]"/>
<aura:handler name="init" value="{!this}" action="{!c.doInit}" />
<aura:handler event="c:SearchKeyChange" action="{!c.searchKeyChange}"/>

<ul>
    <aura:iteration items="{!v.competitors__c}" var="competitor">
        <li>
            <a href="{! '#/sObject/' + competitor__c.Id + '/view'}">
                <p>COMPETITORS GO HERE</p>
                <p>{!competitor__c.Name}</p>
            </a>
        </li>
    </aura:iteration>
</ul>

</aura:component>

CompetitorListController.js

({
doInit : function(component, event) {
    var action = component.get("c.findAll");
    action.setCallback(this, function(a) {
        component.set("v.competitors__c", a.getReturnValue());
    });
    $A.enqueueAction(action);
},


searchKeyChange: function(component, event) {
var searchKey = event.getParam("searchKey");
var action = component.get("c.findComp");
action.setParams({
  "searchKey": searchKey
});
action.setCallback(this, function(a) {
    component.set("v.competitors__c", a.getReturnValue());
});
$A.enqueueAction(action);
}

})

Answer 1

As discussed in comments, you should be using competitor instead of competitor__c from var="competitor".

Another situation in which this same error comes, when you forget to put the "v" i.e value provider to the key.

Uncaught afterRender threw an error in 'markup://ui:inputDateTime' [Assertion Failed!: Unable to get value for key 'progRecord.Start_Date__c'. No value provider was found for 'progRecord'. : false]

In my case, it key should be {!v.progRecord.Start_Date__c}