docs: add documentation for nft module (#13871)

CHANGELOG.md

@@ -58,7 +58,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Improvements
 
-* [13789](https://github.com/cosmos/cosmos-sdk/pull/13789) Add tx `encode` and `decode` endpoints to tx service.
+* (x/nft) [#13836](https://github.com/cosmos/cosmos-sdk/pull/13836) Remove the validation for `classID` and `nftID` from the NFT module.
+* [#13789](https://github.com/cosmos/cosmos-sdk/pull/13789) Add tx `encode` and `decode` endpoints to tx service.
   > Note: This endpoint will only encode proto messages, Amino encoding is not supported.
 * [#13826](https://github.com/cosmos/cosmos-sdk/pull/13826) Support custom `GasConfig` configuration for applications.
 * [#13619](https://github.com/cosmos/cosmos-sdk/pull/13619) Add new function called LogDeferred to report errors in defers. Use the function in x/bank files.

UPGRADING.md

@@ -4,6 +4,8 @@ This guide provides instructions for upgrading to specific versions of Cosmos SD
 
 ## [Unreleased]
 
+## [v0.47.x](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.47.0)
+
 ### Simulation
 
 Remove `RandomizedParams` from `AppModuleSimulation` interface. Previously, it used to generate random parameter changes during simulations, however, it does so through ParamChangeProposal which is now legacy. Since all modules were migrated, we can now safely remove this from `AppModuleSimulation` interface.
@@ -36,6 +38,7 @@ SimApp's `app.go` is now using [App Wiring](https://docs.cosmos.network/main/bui
 This means that modules are injected directly into SimApp thanks to a [configuration file](https://github.com/cosmos/cosmos-sdk/blob/main/simapp/app_config.go).
 The old behavior is preserved and can still be used, without the dependency injection framework, as shows [`app_legacy.go`](https://github.com/cosmos/cosmos-sdk/blob/main/simapp/app_legacy.go).
 If you are using a legacy `app.go` without dependency injection, add the following lines to your `app.go` in order to provide newer gRPC services:
+
 ```go
 autocliv1.RegisterQueryServer(app.GRPCQueryRouter(), runtimeservices.NewAutoCLIQueryService(app.ModuleManager.Modules))
 
@@ -157,6 +160,11 @@ app.ConsensusParamsKeeper = consensusparamkeeper.NewKeeper(appCodec, keys[upgrad
 bApp.SetParamStore(&app.ConsensusParamsKeeper)
 ```
 
+#### `x/nft`
+
+The SDK does not validate anymore the `classID` and `nftID` of an NFT, for extra flexibility in your NFT implementation.
+This means chain developers need to validate the `classID` and `nftID` of an NFT.
+
 ### Ledger
 
 Ledger support has been generalized to enable use of different apps and keytypes that use `secp256k1`. The Ledger interface remains the same, but it can now be provided through the Keyring `Options`, allowing higher-level chains to connect to different Ledger apps or use custom implementations. In addition, higher-level chains can provide custom key implementations around the Ledger public key, to enable greater flexibility with address generation and signing.

tests/e2e/nft/grpc.go

@@ -322,6 +322,18 @@ func (s *IntegrationTestSuite) TestQueryNFTGRPC() {
 			},
 			expectErr: false,
 		},
+		{
+			name: "class id does not exist",
+			args: struct {
+				ClassID string
+				ID      string
+			}{
+				ClassID: "class",
+				ID:      ExpNFT.Id,
+			},
+			expectErr: true,
+			errorMsg:  "not found nft",
+		},
 	}
 	nftURL := val.APIAddress + "/cosmos/nft/v1beta1/nfts/%s/%s"
 	for _, tc := range testCases {

x/nft/README.md

@@ -67,7 +67,12 @@ TotalSupply is responsible for tracking the number of all nfts under a certain c
 
 ## Messages
 
-In this section we describe the processing of messages for the nft module.
+In this section we describe the processing of messages for the NFT module.
+
+:::warning
+The validation of `ClassID` and `NftID` is left to the app developer.  
+The SDK does not provide any validation for these fields.
+:::
 
 ### MsgSend
 
@@ -75,9 +80,9 @@ You can use the `MsgSend` message to transfer the ownership of nft. This is a fu
 
 The message handling should fail if:
 
-* provided `ClassID` is not exist.
-* provided `Id` is not exist.
-* provided `Sender` is not the owner of nft.
+* provided `ClassID` does not exist.
+* provided `Id` does not exist.
+* provided `Sender` does not the owner of nft.
 
 ## Events