Is it possible to use Salesforce REST API in apex controller?
I'd like to use salesforce rest api in Apex Controller class. Main purpose to use rest api in Apex is to fetch listview colums details (colums order and colums field name) and output visualforce page with xlsx format in visualforce. when I try this sample code in Visualforce using fetch api, it works fine, but in Apex class, it fails.
What is set in Salesforce?
Set elements can be of any data type—primitive types, collections, sObjects, user-defined types, and built-in Apex types. Set methods are all instance methods, that is, they all operate on a particular instance of a Set.
What is data table in apex?
apex:dataTable An HTML table that’s defined by iterating over a set of data, displaying information about one item of data per row. The body of the <apex:dataTable> contains one or more column components that specify what information should be displayed for each item of data.
Do I need to configure remote site settings for apex callouts?
Before any Apex callout can call an external site, that site must be registered in the Remote Site Settings page, or the callout fails. Salesforce prevents calls to unauthorized network addresses. If the callout specifies a named credential as the endpoint, you don’t need to configure remote site settings.
What is an Apex callout?
An Apex callout enables you to tightly integrate your Apex with an external service by making a call to an external Web service or sending a HTTP request from Apex code and then receiving the response. Apex provides integration with Web services that utilize SOAP and WSDL, or HTTP services (RESTful services).
Can Apex call out to external site?
Note. Before any Apex callout can call an external site, that site must be registered in the Remote Site Settings page, or the callout fails. Salesforce prevents calls to unauthorized network addresses. If the callout specifies a named credential as the endpoint, you don’t need to configure remote site settings.
Usage
To implement the Callable interface, you need to write only one method: call ( String action, Map< String , Object > args).
Callable Example Implementation
This class is an example implementation of the System.Callable interface.
addAll (fromList)
Adds all of the elements in the specified list to the set if they are not already present.
addAll (fromSet)
Adds all of the elements in the specified set to the set that calls the method if they are not already present.
containsAll (listToCompare)
Returns true if the set contains all of the elements in the specified list. The list must be of the same type as the set that calls the method.
containsAll (setToCompare)
Returns true if the set contains all of the elements in the specified set. The specified set must be of the same type as the original set that calls the method.
equals (set2)
Compares this set with the specified set and returns true if both sets are equal; otherwise, returns false.
removeAll (listOfElementsToRemove)
Removes the elements in the specified list from the set if they are present.
removeAll (setOfElementsToRemove)
Removes the elements in the specified set from the original set if they are present.
Set Up Authentication
Because you’re working in Salesforce, you can use an authentication shortcut for this activity. You create a Visualforce page to create a session, and use the session ID to authenticate to the Pardot API.
Create a Class to Store the API Results
Next, create a class to store the results of the custom redirect query. The class also handles converting JSON response strings into the object fields.
Create a Class to Query Custom Redirects
The next class performs the query and returns a CustomRedirects object.
