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I am completely new to Apex and could really use some help with what seems to be a simple task.  I have a formula on the contact, Persona_True__c, that returns a 1 if the custom field "persona" is populated and a 0 if it is blank.

I would like to have a roll-up summary that sums this field at the account level in a field called Related_Personas__c.  

Because we can't roll-up from contact to account I'm reading that this type of action needs to be a trigger, but I don't even know where to start.  Does anyone have any thoughts or expertise they can share to help me out? 
I'm wondering if this is just a glitch in Salesforce and if anyone has any workaround. I currently have a Trigger on ContentDocumentLink that sends an email to the owner of a custom object record when a File or Note is created and attached to that record. The trigger also attaches file information and the body of the Note if it's a ContentNote being inserted. The trigger handles the logic in differentiating Notes from other file types. The problem is when the user hits the button to create a new Note in classic or in the Console, an empty, untitled, new note record is inserted instantly firing my trigger before the user has time to add content to the body. In Lightning it at least allows the user to fill out the header of the note before saving, but saves before the note body is filled out. Cancelling out of creating the note still leaves the blank note saved and attached to the record. Any help in understanding why the note saves before the user hits the save button would be appreciated.
Hi there :)

i'm currently working on an native Android app for my company and ran into some problems with Salesforce lately.

I hope i can find some help here.

What i want to achieve:
The company has a lot of Accounts in Salesforce with 3 important fields for the app: Name, Business (Workshop or Parts Dealer) and location(latitude, longitude)
I would like to show those Accounts(Workshops/Parts Dealers) as markers on a google map in my Android app based on a radius around the user's current location. So it would be more than sufficient to get the data as JSON or XML(i read about sObjects, which would be nice too)

The app will be freely available on Google Play Store and every user should be able to see all the Workshops/Parts dealers around the world.

The problem i'm facing is that i can't find a way to fetch the data inside my app without authenticating every user with a Salesforce-Login. 
Which API is the best to use in this case?

It would be so awsome if anybody could help me with this problem.

What i tried so far: 
- SalesforceMobileSDK: If i extend SalesForceApplication i always end up with the Salesforce-Login Screen.
It seems that every client has to be authenticated for API-calls to work. I tried using the method "peekUnauthenticatedRestClient", but this method only works on full path URL's(e.g. "https://api.spotify.com/v1/search?q=James%20Brown&type=artist"), which isn't really practically for my Use-case.

- I feel like i read nearly all docs about salesforce api, but can't quite get my head around how to solve this problem, although it seems like to be a pretty common use-case.  

- would a salesforce-apex method which would select all records inside a set radius around the user's location be accessable without authentication?

Thanks for your help in advance!

Roman
Hi, I am having trouble with the "Attributes and Expressions" module from trailhead.

Here is the challenge:
Create a Lightning Component to display a single item for your packing list.
  • Create a component called campingListItem that displays the name (ui:outputText) and the three custom fields using the appropriate output components.
  • Add an attribute named 'item' for type Camping_Item__c.
I created an component named campingListItem and this is the code:
<aura:component >
    <aura:attribute name="item" type="<my_domain>__Camping_Item__c"/>
    
    <ui:outputText value="{!v.item.Name}"/>
    <ui:outputCheckbox value="{!v.item.<my_domain>__Packed__c}"/>
    <ui:outputCurrency  value="{!v.item.<my_domain>__Price__c}"/>
    <ui:outputNumber value="{!v.item.<my_domain>__Quantity__c}"/>
</aura:component>

The error that I am getting is: "Challenge Not yet complete... here's what's wrong: 
The packingListItem Lightning Component's attribute tag doesn't exist or its attributes are not set correctly."

With this, I tried to create another component, with the name "packingListItem", but It didn't work.

Can anyone help me?

Thanks,