Questions tagged [generics]
The generics tag has no usage guidance.
34 questions
-2
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1
answer
47
views
Can we rely on reference when it comes to changing Map items changing?
My code
for(FieldDefinition def : [SELECT
QualifiedApiName,
EntityDefinitionId,
EntityDefinition.QualifiedApiName
FROM FieldDefinition
WHERE EntityDefinitionId in :...
- 941
-1
votes
1
answer
532
views
Generic lightning web component [closed]
I want to create a related list with LWC that i can use for all object.
Can someone help me with any ideato solve this problem.
0
votes
1
answer
3k
views
How to use custom metadata to map generic JSON
I want to create a generic REST API Webservice where the configuration of mapping fields can be done trough custom meta data. How would I set this up?. I want to be able to have an administrator add ...
- 2,320
0
votes
2
answers
1k
views
Is it possible to Generically deserialize a Json string wit nested arrays in Apex
I want to be able to Generically deserialize a Json string with nested arrays for a web-service, since the structure isn't known beforehand and kan change a lot. I did some reading a seems doable but ...
- 2,320
1
vote
1
answer
4k
views
Cannot deploy flow, Getting error 'Screen component 'ComponentName' is missing a type mapping 'T'
I have created a flow screen component that work for multiple object. In the flow, I have created a collection variable. I have created an LWC component that uses the collection variable.
When I try ...
- 385
0
votes
2
answers
832
views
updating reference field using generics sObject
I am trying to perform upsert on opportunity based on external Id. I am building the opportunity objects based on sObject as I am using that function for other objects too.
Now Opportunity object ...
- 245
0
votes
1
answer
951
views
Tips to generalize code in apex with Map<string, set<string>> and Map<string, set<SObject>> and how to call method of SObject
I am working on some generalization of my code and I'm struggling with some cases which are irritating me because I think I'm having code duplicity.
1) I'm often working with some map<string, set&...
- 125
1
vote
0
answers
100
views
Create dynamic triggers based on user selection from managed package [duplicate]
I have a requirement where I need to create two triggers inside a managed package. So, when the package is installed, the admin has a choice to either use the default objects available in the package ...
- 11
8
votes
3
answers
6k
views
How to accept generic "SObject" in Lightning Web Component for Flows?
I've got a custom built LWC to be used within a screen component in a flow.
My component basically renders a collection of SObjects in a distinct way.
It can also deal with different types of sObjects....
- 1,022
1
vote
2
answers
1k
views
Generic function - Custom meta data type
I would like to do a generic function to get custom meta data type records and return it as a Map. In a first time with just one field , that means Map<String,String> and in a second time with ...
- 636
0
votes
1
answer
3k
views
How to get recordtypeid from generic object
I want to be able to pass an object, and recordtypelabel as string into a controller and get the recordtypeId. How do I achieve this. I currently get variable does not exist for the custom object.
@...
- 2,320
0
votes
2
answers
472
views
Is it possible to create a generic Map swapper?
I have a method:
public Map<Object, Object> swap(Map<Object, Object> valueByKeyMap) {
Map<Object, Object> keyByValueMap = new Map<Object, Object>();
for (Object key : ...
- 4,674
1
vote
2
answers
2k
views
Is it possible to convert Map<Object, List<Object>> to Map<Id, List<SomeConcreteSObject>> without a loop?
As a Salesforce developer, I am frequently working with Maps and am looking to abstract the process of generating maps from SObject lists.
I've created the following helper class:
private class ...
- 4,674
-2
votes
1
answer
171
views
How to create a Map with generics Id and String?
How to create a Map<Id, String>([SELECT Id, Name from Account]);?
The query returns Map<Id, Account>.
I want to get a Map<Id, String> without using loops and without having to ...
- 427
1
vote
1
answer
674
views
Dealing with Generics in Apex
I have some code that i want to try and emulate generics for. I know there are no generics in Apex but is there something we can do instead?
Let me explain
(String) sfBorr.get('SSN__pc');
sfBorr is ...
- 427
8
votes
1
answer
544
views
If I know the API Name, how can I get and work with the Schema.ChildRelationship?
Like many SFDC developers, we have SObjects which are related to other custom relationships.
So, for example, MyCustomObject__c could have a relationship with MyCustomRelationship__c which in Apex we ...
- 4,674
6
votes
2
answers
2k
views
In Apex, can I detect if an Object is a Map, regardless of parameterized types?
When I declare a Map, I need to give the types, e.g.:
Map<Id, SObject> sObjectByIdMap = new Map<Id, SObject>();
We can assign map to generic values as Objects:
Object value = ...
- 4,674
10
votes
2
answers
12k
views
What is the best way to cast/convert Map<String, SObject> to Map<Object, Object> and back again?
To reduce code duplication, at the risk of type safety, I have some method:
public Map<Object, Object> doSomething(Map<Object, Object> inputMap) {
Map<Object, Object> outputMap;
...
- 4,674
2
votes
1
answer
79
views
How can I abstract building maps from SObject Lists in a good way? [duplicate]
I frequently find I want/need to map a list of SObjects by a value other than it's own Id.
So, I'd like to abstract this process to make it reusable.
For example, I might want to map Contacts by ...
- 4,674
4
votes
2
answers
449
views
How can I upsert a homogeneous List<SObject>, in a good way? [duplicate]
I have some abstracted code, which at the end of some process will create a homogeneous list of SObjects.
It could be a list of Accounts, it could be a list of contacts, it could be a list of some ...
- 4,674
1
vote
1
answer
1k
views
Generic SObject Utility to dynamically set field values from Map
I'm trying to create a generic utility method which takes a List of sObjects and a Map of fieldNames to fieldValues. I'd like to, for example, do the following:
List<Lead> leadList = [SELECT Id ...
- 1,209
6
votes
3
answers
2k
views
Does apex support generics?
I don't know if Apex supports generics but how can I make the below class more generics where I should be able to pass any data type?
below is the example:
the problem I have is this:
public class ...
- 7,153
8
votes
1
answer
2k
views
Pros and cons of generic SObject list vs multiple lists of objects
For one of the requirements I have to write code to update multiple records of different objects. Originally I was planning to do the obvious: get needed records, change some value, update these lists,...
- 5,294
13
votes
2
answers
12k
views
How to write a generic list<t> method that will cast at runtime?
I recently tripped across the need to take a list of objects (instances of a class--not sobjects) and split them into smaller lists of 200 members each.
The unit test below shows the code inside a ...
- 465
5
votes
3
answers
6k
views
Getting a type of the generic object
How to get a type of the generic object? I have a method that gets as parameter some object. It can be realy everything. In my example it is a list of strings. But it can be a map or set or some other ...
- 22.1k
7
votes
1
answer
6k
views
Is it possible to create a method that uses generics? [duplicate]
... or at least pass in a specific class? Here is what I have right now:
private static invoice_response GetResponse(String jsonResponse)
{
invoice_response deserialized = (invoice_response) ...
- 1,481
3
votes
1
answer
2k
views
Is it possible to write a method that accepts both SObjects and Apex Class Instances?
I have an Apex method that takes a list of SObjects, a source field name, and a destination fieldname. For each SObject in the list, it looks at the source field, does some work, and populates the ...
- 12.1k
33
votes
1
answer
8k
views
Generic Apex Trigger
So I was kind of throwing round the idea of making a generic apex trigger that is callable by multiple objects. Say you have the following sObjects:
Account
Sales__c
Sales_Contacts__c
And I wanted ...
- 845
14
votes
1
answer
6k
views
How do I use Type.forName to deserialize a generic list of SObjects?
When the new Apex type methods were added in Summer '12, it was possible to do
Type t = Type.forName('MyClass');
MyClass newObj = (MyClass)t.newInstance();
What is the equivalent when I want to ...
- 16.5k
5
votes
1
answer
76
views
How to get the old Test Class UI back? Or possible workarounds with the new UI?
Is there anyone else who is sorely missing the old test class UI where it shows the entire list of Apex classes covered by running one test class? Another good feature of the old UI was that you could ...
- 4,652
7
votes
2
answers
4k
views
What is "Skip to main content"?
In any Salesforce page, if no element is in focus and you press Tab⇄, a hidden element Skip to main content is put into focus.
What does Skip to main content do?
- 4,652
10
votes
1
answer
8k
views
What is the correct JSON to deserialize a map of sObjects?
I'm trying to store a map of sObjects in a static resource. I want to be able to store default values for test setup methods. I was able to get it working with the following JSON in the static ...
- 7,481
9
votes
4
answers
4k
views
How do you deserialize json into the correct virtual class?
Let's say I have a virtual class and two classes that extend it and I am getting a JSON response that could be either one of those classes. Is there a way to deserialize the JSON into the appropriate ...
- 7,481
39
votes
2
answers
20k
views
Can you use generics in Apex?
While researching the possibility of using generics in apex I can across a blog with this:
"Generics are partially supported in Apex, you must be using them with
Collections and Batch Apex."
...
- 7,697