nft updates (#530)

* nft updates

* use hasMetadata

schema.graphql

@@ -109,7 +109,10 @@ type Nft @entity{
     block: Int  
 
     "number of orders executed for all underlying datatokens"                                
-    orderCount: BigInt!                                              
+    orderCount: BigInt!  
+
+    "has metadata"
+    hasMetadata: Boolean!                                            
 }
 
 type OrderReuse @entity {

src/mappings/nftUpdate.ts

@@ -30,6 +30,7 @@ export function handleMetadataCreated(event: MetadataCreated): void {
 
   nft.assetState = event.params.state
   nft.providerUrl = event.params.decryptorUrl.toString()
+  nft.hasMetadata = true
 
   const nftUpdate = new NftUpdate(
     getId(event.transaction.hash.toHex(), nftAddress)
@@ -57,7 +58,7 @@ export function handleMetadataUpdated(event: MetadataUpdated): void {
   if (!nft) return
 
   nft.assetState = event.params.state
-
+  nft.hasMetadata = true
   const nftUpdate = new NftUpdate(
     getId(event.transaction.hash.toHex(), nftAddress)
   )

src/mappings/utils/tokenUtils.ts

@@ -59,6 +59,7 @@ export function createNftToken(address: Address): Nft {
   token.block = 0
   token.tx = ''
   token.orderCount = BigInt.zero()
+  token.hasMetadata = false
   token.save()
   addNft()
   return token
@@ -80,6 +81,18 @@ export function getNftTokenWithID(tokenId: string): Nft {
     nftToken.name = ''
     nftToken.symbol = ''
     nftToken.address = tokenId
+    nftToken.providerUrl = ''
+    nftToken.tokenUri = ''
+    nftToken.owner = ''
+    nftToken.creator = ''
+    nftToken.assetState = 0
+    nftToken.template = ''
+    nftToken.transferable = true
+    nftToken.createdTimestamp = 0
+    nftToken.block = 0
+    nftToken.tx = ''
+    nftToken.orderCount = BigInt.zero()
+    nftToken.hasMetadata = false
     nftToken.save()
     addNft()
   }