I have a many-to-many structure mapped to entity framework. This is a sample of what it looks like:
User UserTag Tag
------- -------- -------
IdUser(PK) IdUserTag(PK) IdTag(PK)
Name IdUser(FK) TagName
Desc IdTag(FK) Active
Now, I needed to exclude from any request of any method the viewing of Tags that were Active=false.
First, I tried doing it manually in every method, like:
public User GetById(int id)
{
var item = UserRepository.GetById(id); //This is just a repository that calls the EF context
//EF automatically maps it to the *UserTags* property
foreach(var tag in item.UserTags)
{
if(tag.Tag.Active == false)
item.UserTags.Remove(tag);
}
}
But it throws the following exception:
The relationship could not be changed because one or more of the foreign-key properties is non-nullable
So, I wanted to know if there's a way to conditionaly filter every request made to a specific table, whether it is select or a join request.
Try this in your GetById method:
var user.UserTags = dbContext.Entry(user)
.Collection(u => u.UserTags)
.Query()
.Where(ut => ut.Active == true)
.ToList();
The supplied code fails because it is attempting to remove items from the data entities not the list. If you want to pass the data entity around instead of the data model, you need to not use Remove. Something like the below (untested should work).
tags = item.UserTags.Where((ut) => ut.Active).ToList();
This line will get you a list of data entities that are active. However, you should really map all of this into a data model (see AutoMapper) and then you would not be removing items from the database.
I have a problem with one trigger. I was trying to set up the solution which will give me the possibility to assign flexible targets for campaigns. I was trying to solve it via formula field but it occurred to be too complex and I was advised it needs to be the apex trigger. I created the custom setting of list type, so then I could query it in the apex trigger. I created the "Apex_Calculator__c" field which combined values from two fields (Event Region [located on the parent campaign level] and Started Campaign [located on the sub-campaign level]). The value from the "Apex_Calculator__c" field was about to bring the same values as in the custom setting.
My knowledge of Apex triggers is limited, so I asked for the help on the internet. I received the help and the trigger was bringing target values in the sub campaign. However, the problem occurred on the parent campaign level. As far as I wanted to change the Event Region (which as I mentioned is part of the "Apex_Calculator__c" formula field), I started to receive the error message:
*
PopulateTarget: execution of BeforeUpdate caused by:
System.NullPointerException: Attempt to de-reference a null object:
Trigger.PopulateTarget: line 18, column 1
*
trigger PopulateTarget on Campaign (before insert, before update)
{
Map <String, Id> recordTypes = new Map <String, Id> ();
for (RecordType recordType : [SELECT Id, DeveloperName FROM RecordType WHERE sObjectType = 'Campaign'])
{
if (recordType.DeveloperName == 'Conference')
{
recordTypes.put(recordType.DeveloperName, recordType.Id);
}
}
for(Campaign campaign : Trigger.new)
{
// Make sure that the campaign record type is not in the map (in the map we keep the ones that we want to exclude)
if (recordTypes.get(campaign.RecordTypeId) == null && String.isNotBlank(campaign.Apex_Calculator__c) == true)
{
String target = DSTargets__c.getInstance(campaign.Apex_Calculator__c).Target__c;
campaign.DS_Target_Multiplier__c = Target;
}
}
}
I feel really lost what is wrong in here. Could anyone help me with this error?
Looks like you don't have DSTargets custom settings for some campaign.Apex_Calculator__c values.
Try this:
// Make sure that the campaign record type is not in the map (in the map we keep the ones that we want to exclude)
if (recordTypes.get(campaign.RecordTypeId) == null && String.isNotBlank(campaign.Apex_Calculator__c) == true)
{
if (DSTargets__c.getInstance(campaign.Apex_Calculator__c) == null)
{
System.debug('### A DSTargets named \'' + campaign.Apex_Calculator__c + '\' doesn't exist');
continue;
}
String target = DSTargets__c.getInstance(campaign.Apex_Calculator__c).Target__c;
campaign.DS_Target_Multiplier__c = Target;
}
Here is the problem I'm trying to solve:
When a new TASK/EVENT is created, if the user is a certain profile - we want to update a field on CONTACT with the day the T/E was created.
I tried doing a workflow rule and field update- but I couldn't get it to work... I think since this is a Standard -Standard object relationship via lookup, it might have a problem doing a field update. Any other ideas?? I'd prefer to use the platform for this one...
HALP!
Thanks
We have done exactly what you are talking about via an Apex trigger. Something like this...
//I'm sure this doesn't compile, but it gives you the idea
trigger taskTrigger on Task( after insert, after update ){
Task t = trigger.new ;
Contact contact = [Select Id from Contact where Id = :t.whoId] ;
contact.yourfield = t.AcitivityDate ;
update contact ;
}
I have custom object KeywordAccountAssociation__c. This object has three fields
Account__c - Master-Detail(Account)
Keyword__c - Master-Detail(Keyword)
Compositecp__c - Text(255) (External ID) (Unique Case Sensitive)
I have a custom field in Account
DD_Segment__c - multi-picklist
Now I want to update (Insert is fine too) values of DD_Segment__c whenever KeywordAccountAssociation__c is updated. I could write trigger for this but I don't know how? I am new to Salesforce Development and my background is ruby (so getting accustomed to apex is bit difficult for me).
KeywordAccountAssociation__c has multiple rows of Account__c which has same account_id and those account_id are related to a record of custom object Keyword__c. I want to get all keywords related to one account and update in its (account's) multi-picklist. How can I achieve this? If you have doubts about this please do ask. Thanks!
One issue is related to learning to work with triggers in general, which can be started with Salesforce Apex Developer Documents on Triggers
but to answer your actual question, you would essentially need to build a trigger against your custom object that would update the related account. It might look something like this:
trigger keywordAccountUpdate on KeywordAccountAssociation__c (after insert, after update){
set<id> = new set<id>();
for (KeywordAccountAssociation__c a : Trigger.new)
accountIds.put(a.Account__c);
map<id,Account> accountMap = new map<id,Account>([select id, DD_Segment__c from Account where id in :accountIds]);
for (KeywordAccountAssociation__c kaa : Trigger.new){
if (AccountMap.containskey(kaa.Account__c)){
Account thisAccount = AccountMap.get(kaa.Account__c);
String s = thisAccount.DD_Segment__c + ';new value'; // Always add value
if ((thisAccount.DD_Segment__c).contains('second value')
s += ';second value';
AccountsToUpdate.add(new Account(id=thisAccount.id, DD_Segment__c = s));
}
}
}
Please keep in mind that I don't have the structure to test this trigger, I just free handded it, so YMMV.
I want to create two objects and link them via a parent child relationship in C# using the Metadata API.
I can create objects and 'custom' fields for the objects via the metadata, but the service just ignores the field def for the relationship.
By snipet for the fields are as follows:
CustomField[] fields = new CustomField[] { new CustomField()
{
type = FieldType.Text,
label = "FirstName",
length = 50,
lengthSpecified = true,
fullName = "LJUTestObject__c.FirstName__c"
},
new CustomField()
{
type = FieldType.Text,
label = "LastName",
length = 50,
lengthSpecified = true,
fullName = "LJUTestObject__c.Lastname__c"
},
new CustomField()
{
type = FieldType.Text,
label = "Postcode",
length = 50,
lengthSpecified = true,
fullName = "LJUTestChildObject__c.Postcode__c"
},
new CustomField()
{
type = FieldType.MasterDetail,
relationshipLabel = "PostcodeLookup",
relationshipName = "LJUTestObject__c.LJUTestObject_Id__c",
relationshipOrder = 0,
relationshipOrderSpecified = true,
fullName = "LJUTestChildObject__c.Lookup__r"
}
};
The parent object looks like:
LJUTestObject
ID,
FirstName, Text(50)
LastName, Text(50)
The child objext looks like:
LJUTestChildObject
ID,
Postcode, Text(50)
I want to link the parent to the child so one "LJUTestObject", can have many "LJUTestChildObjects".
What values do I need for FieldType, RelationshipName, and RelationshipOrder to make this happen?
TL;DR:
Use this as a template for accomplishing what you want:
var cf = new CustomField();
cf.fullName = "ChildCustomObject__c.ParentCustomField__c";
cf.type = FieldType.MasterDetail;
cf.typeSpecified = true;
cf.label = "Parent Or Whatever You Want This To Be Called In The UI";
cf.referenceTo = "ParentCustomObject__c";
cf.relationshipName = "ParentOrWhateverYouWantThisToBeCalledInternally";
cf.relationshipLabel = "This is an optional label";
var aUpsertResponse = smc.upsertMetadata(metadataSession, null, null, new Metadata[] { cf });
The key difference:
The natural temptation is to put the CustomField instances into the fields array of a CustomObject, and pass that CustomObject to the Salesforce Metadata API. And this does work for most data fields, but it seems that it does not work for relationship fields.
Instead, pass the CustomField directly to the Salesforce Metadata API, not wrapped in a CustomObject.
Those muted errors:
Turns out that errors are occurring, and the Salesforce Metadata API knows about them, but doesn't bother telling you about them when they occur for CustomFields nested inside a CustomObject.
By passing the CustomField directly to the Metadata API (not wrapped in a CustomObject), the call to upsertMetadata will still return without an exception being thrown (as it was already doing for you), but this time, if something goes wrong, upsertResponse[0].success will be false instead of true, and upsertResponse[0].errors will give you more information.
Other gotchas
Must specify referenceTo, and if it doesn't match the name of an existing built-in or custom object, the error message will be the same as if you had not specified referenceTo at all.
fullName should end in __c not __r. __r is for relationship names, but remember that fullName is specifying the field name, not the relationship name.
relationshipName - I got it working by not including __r on the end, and not including the custom object name at the start. I haven't tested to be sure other ways don't work, but be aware that at the very least, you don't need to have those extra components in the relationshipName.
Remember generally that anything with label in its name is probably for display to users in the UI, and thus can have spaces in it to be nicely formatted the way users expect.
Salesforce... really???
(mini rant warning)
The Salesforce Metadata API is unintuitive and poorly documented. That's why you got stuck on such a simple thing. That's why no-one knew the answer to your question. That's why, four years later, I got stuck on the same thing. Creating relationships is one of the main things you would want to do with the Salesforce Metadata API, and yet it has been this difficult to figure out, for this long. C'mon Salesforce, we know you're a sales company more than a tech company, but you earn trazillions of dollars and are happy to show it off - invest a little more in a better API experience for the developers who invest in learning your platform.
I've not created these through the meta data API like this myself, but I'd suggest that:
relationshipName = "LJUTestObject__c.LJUTestObject_Id__c
Should be:
relationshipName = "LJUTestObject__c.Id
as Id is a standard field, the __c suffix is only used for custom fields (not standard fields on custom objects). Also, it may be that the relationship full name should end in __c not __r, but try the change above first and see how you go.
SELECT
Id,
OwnerId,
WhatId,
Reminder_Date_Time__c,
WhoId,
Record_Type_Name__c,
Task_Type__c,
Assigned_Date__c,
Task_Status__c,
ActivityDate,
Subject,
Attended_By__c,
Is_Assigned__c
FROM Task
WHERE
(NOT Task_Status__c LIKE 'Open') AND
ActivityDate >= 2017-12-13 AND
(NOT Service__r.Service_State__c LIKE 'Karnataka')