feat: implement get_campaigns_by_creator function

contract/contract/src/crowdfunding.rs

@@ -113,6 +113,18 @@ impl CrowdfundingTrait for CrowdfundingContract {
             .instance()
             .set(&StorageKey::AllCampaigns, &all_campaigns);
 
+        // Track campaigns by creator
+        let creator_key = StorageKey::CreatorCampaigns(creator.clone());
+        let mut creator_campaigns = env
+            .storage()
+            .instance()
+            .get(&creator_key)
+            .unwrap_or(Vec::new(&env));
+        creator_campaigns.push_back(id.clone());
+        env.storage()
+            .instance()
+            .set(&creator_key, &creator_campaigns);
+
         events::campaign_created(&env, id, title, creator, goal, deadline);
 
         Ok(())

contract/contract/test/get_campaigns_by_creator_test.rs

@@ -0,0 +1,74 @@
+#![cfg(test)]
+
+use crate::{
+    crowdfunding::{CrowdfundingContract, CrowdfundingContractClient},
+};
+use soroban_sdk::{testutils::Address as _, Address, BytesN, Env, String};
+
+#[test]
+fn test_get_campaigns_by_creator_multiple_users() {
+    let env = Env::default();
+    env.mock_all_auths();
+
+    let contract_id = env.register(CrowdfundingContract, ());
+    let client = CrowdfundingContractClient::new(&env, &contract_id);
+
+    // Initialize contract
+    let admin = Address::generate(&env);
+    let token_admin = Address::generate(&env);
+    let token_contract = env.register_stellar_asset_contract_v2(token_admin.clone());
+    let token_address = token_contract.address();
+
+    client.initialize(&admin, &token_address, &0);
+
+    // Create campaigns with two different creators
+    let creator1 = Address::generate(&env);
+    let creator2 = Address::generate(&env);
+
+    let campaign_id1 = BytesN::from_array(&env, &[1u8; 32]);
+    let campaign_id2 = BytesN::from_array(&env, &[2u8; 32]);
+    let campaign_id3 = BytesN::from_array(&env, &[3u8; 32]);
+
+    let title1 = String::from_str(&env, "Campaign 1");
+    let title2 = String::from_str(&env, "Campaign 2");
+    let title3 = String::from_str(&env, "Campaign 3");
+    let goal = 1_000_000i128;
+    let deadline = env.ledger().timestamp() + 86400;
+
+    // Creator 1 creates 2 campaigns
+    client.create_campaign(
+        &campaign_id1,
+        &title1,
+        &creator1,
+        &goal,
+        &deadline,
+        &token_address,
+    );
+
+    client.create_campaign(
+        &campaign_id2,
+        &title2,
+        &creator1,
+        &goal,
+        &deadline,
+        &token_address,
+    );
+
+    // Creator 2 creates 1 campaign
+    client.create_campaign(
+        &campaign_id3,
+        &title3,
+        &creator2,
+        &goal,
+        &deadline,
+        &token_address,
+    );
+
+    // Verify creator1 has 2 campaigns
+    let campaigns1 = client.get_campaigns_by_creator(&creator1);
+    assert_eq!(campaigns1.len(), 2);
+
+    // Verify creator2 has 1 campaign
+    let campaigns2 = client.get_campaigns_by_creator(&creator2);
+    assert_eq!(campaigns2.len(), 1);
+}

contract/contract/test/mod.rs

@@ -1,4 +1,5 @@
 mod close_pool_test;
 mod create_pool;
 mod crowdfunding_test;
+mod get_campaigns_by_creator_test;
 mod verify_cause;