From bc35785f80f8124d321fcd50e81090a3f2b793fc Mon Sep 17 00:00:00 2001
From: Amiya Behera <amiyatulu@gmail.com>
Date: Tue, 14 Jan 2025 18:23:37 +0530
Subject: [PATCH] update

---
 .../positive-externality-rpc/src/lib.rs       | 30 +++++++++++++++++++
 .../src/lib.rs                                |  2 ++
 .../positive-externality/src/extras.rs        | 19 ++++++++++++
 runtime/src/lib.rs                            |  4 +++
 4 files changed, 55 insertions(+)

diff --git a/custom-pallets/positive-externality/positive-externality-rpc/src/lib.rs b/custom-pallets/positive-externality/positive-externality-rpc/src/lib.rs
index 69d0217..b2281ea 100644
--- a/custom-pallets/positive-externality/positive-externality-rpc/src/lib.rs
+++ b/custom-pallets/positive-externality/positive-externality-rpc/src/lib.rs
@@ -65,6 +65,15 @@ pub trait PositiveExternalityApi<BlockHash, AccountId> {
 		at: Option<BlockHash>,
 	) -> RpcResult<Option<Vec<u64>>>;
 
+	#[method(name = "positiveexternality_paginateposts_latest")]
+	fn paginate_posts_by_address_latest(
+		&self,
+		user: AccountId,
+		page: u64, 
+		page_size: u64,
+		at: Option<BlockHash>,
+	) -> RpcResult<Option<Vec<u64>>>;
+
 
 }
 
@@ -265,5 +274,26 @@ where
 		Ok(res)
 	}
 
+	fn paginate_posts_by_address_latest(
+		&self,
+		user: AccountId,
+		page: u64, 
+		page_size: u64,
+		at: Option<Block::Hash>,
+	) -> RpcResult<Option<Vec<u64>>> {
+		let api = self.client.runtime_api();
+		let at = at.unwrap_or_else(||
+			// If the block hash is not supplied assume the best block.
+			self.client.info().best_hash);
+
+		let runtime_api_result = api.paginate_posts_by_address_latest(at, user, page, page_size);
+
+		fn map_err(error: impl ToString, desc: &'static str) -> ErrorObjectOwned {
+			ErrorObject::owned(Error::RuntimeError.into(), desc, Some(error.to_string()))
+		}
+		let res = runtime_api_result.map_err(|e| map_err(e, "Unable to query dispatch info."))?;
+		Ok(res)
+	}
+
 	
 }
diff --git a/custom-pallets/positive-externality/positive-externality-runtime-api/src/lib.rs b/custom-pallets/positive-externality/positive-externality-runtime-api/src/lib.rs
index 72f48ce..4c3fe54 100644
--- a/custom-pallets/positive-externality/positive-externality-runtime-api/src/lib.rs
+++ b/custom-pallets/positive-externality/positive-externality-runtime-api/src/lib.rs
@@ -16,5 +16,7 @@ sp_api::decl_runtime_apis! {
 		fn selected_as_juror(user_to_calculate: AccountId, who: AccountId) -> bool;
 		fn post_by_address_length(user: AccountId) -> u64;
 		fn paginate_posts_by_address(user: AccountId, page: u64, page_size: u64) -> Option<Vec<u64>>;
+		fn paginate_posts_by_address_latest(user: AccountId, page: u64, page_size: u64) -> Option<Vec<u64>>;
+
 	}
 }
diff --git a/custom-pallets/positive-externality/src/extras.rs b/custom-pallets/positive-externality/src/extras.rs
index a41103a..38003ef 100644
--- a/custom-pallets/positive-externality/src/extras.rs
+++ b/custom-pallets/positive-externality/src/extras.rs
@@ -189,4 +189,23 @@ impl<T: Config> Pallet<T> {
 		let end = (start + page_size).min(all_posts.len() as u64);
 		Some(all_posts[start as usize..end as usize].to_vec())
 	}
+
+	pub fn paginate_posts_by_address_latest(
+		user: T::AccountId,
+		page: u64,
+		page_size: u64,
+	) -> Option<Vec<u64>> {
+		let mut all_posts = PostByAddresss::<T>::get(user);
+		all_posts.reverse();
+	
+		let start = (page - 1) * page_size;
+
+		if start >= all_posts.len() as u64 {
+			// If start exceeds available posts, return None (no more pages).
+			return None;
+		}
+
+		let end = (start + page_size).min(all_posts.len() as u64);
+		Some(all_posts[start as usize..end as usize].to_vec())
+	}
 }
diff --git a/runtime/src/lib.rs b/runtime/src/lib.rs
index dfd7b61..0e9b15d 100644
--- a/runtime/src/lib.rs
+++ b/runtime/src/lib.rs
@@ -703,6 +703,10 @@ impl_runtime_apis! {
 			PositiveExternality::paginate_posts_by_address(user, page, page_size)
 		}
 
+		fn paginate_posts_by_address_latest(user: AccountId, page: u64, page_size: u64) -> Option<Vec<u64>>{
+			PositiveExternality::paginate_posts_by_address_latest(user, page, page_size)
+		}
+
 	}
 
 	impl project_tips_runtime_api::ProjectTipsApi<Block, AccountId> for Runtime {