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BroncoBoy Need Help Generating a Map Of Lists
We have Account records with a field of FS_ID__c (text). Several accounts may have the same FS_ID__c. I would like to generate a map of the reverse: a map of lists where we show which account ID's are associated to each particular FS_ID__c. I want the map to include all FS_ID__c's. Is that possible? If so, how can I poplulate the map? My intent is to use MyMap.get() method to give me the accounts for FS_ID__c '1234'. The purpose: to avoid running a query each time I want to know the accounts associated to each FS_ID__c. Thanks in advance for your help - alternative suggestions/approaches are welcome as well.
Example of desired effect:
public map <String, list <String>> MyMap = new map <String, list <String>>
{
'FSID1234' => new list<String> {'a0yW0000000zC177', 'a0yW0000000zC178', 'a0yW0000000zC179'},
'FSID5678' => new list<String> {'a0yW0000000zC187', 'a0yW0000000zC188', 'a0yW0000000zC189'},,
'FSID5678' => new list<String> {'a0yW0000000zC197', 'a0yW0000000zC198', 'a0yW0000000zC199'},
};
Referernce:
http://www.davehelgerson.com/?p=379
Example of desired effect:
public map <String, list <String>> MyMap = new map <String, list <String>>
{
'FSID1234' => new list<String> {'a0yW0000000zC177', 'a0yW0000000zC178', 'a0yW0000000zC179'},
'FSID5678' => new list<String> {'a0yW0000000zC187', 'a0yW0000000zC188', 'a0yW0000000zC189'},,
'FSID5678' => new list<String> {'a0yW0000000zC197', 'a0yW0000000zC198', 'a0yW0000000zC199'},
};
Referernce:
http://www.davehelgerson.com/?p=379
Map <String, List <String>> myMap = new Map <String, List <String>>();
for (Account account : [Select id, FS_ID__c from Account]) {
List<String> accounts = myMap.get(account.FS_ID__c );
if (accounts == null) {
accounts = new List<String>();
myMap.put(account.FS_ID__c, accounts);
}
accounts.add(account.id);
}
All Answers
Map <String, List <String>> myMap = new Map <String, List <String>>();
for (Account account : [Select id, FS_ID__c from Account]) {
List<String> accounts = myMap.get(account.FS_ID__c );
if (accounts == null) {
accounts = new List<String>();
myMap.put(account.FS_ID__c, accounts);
}
accounts.add(account.id);
}