Handle additional subgraph types BigDecimal and Bytes in codegen (#89)

* Handle additional subgraph types BigDecimal and Bytes

* Use bigint and Decimal array transformers

packages/codegen/src/entity.ts

@@ -244,6 +244,9 @@ export class Entity {
       // Add subgraph entity specific columns.
       entityObject = this._addSubgraphColumns(subgraphTypeDefs, entityObject, def);
 
+      // Add decimalTransformer column option if required.
+      this._addDecimalTransformerOption(entityObject);
+
       // Add bigintTransformer column option if required.
       this._addBigIntTransformerOption(entityObject);
 
@@ -282,32 +285,118 @@ export class Entity {
   }
 
   _addBigIntTransformerOption (entityObject: any): void {
+    let importObject = entityObject.imports.find((element: any) => {
+      return element.from === '@vulcanize/util';
+    });
+
     entityObject.columns.forEach((column: any) => {
-      // Implement bigintTransformer for bigint types.
-      if (['bigint', 'bigint[]'].includes(column.tsType)) {
+      // Implement bigintTransformer for bigint type.
+      if (column.tsType === 'bigint') {
         column.columnOptions.push(
           {
             option: 'transformer',
             value: 'bigintTransformer'
           }
         );
 
-        const importObject = entityObject.imports.find((element: any) => {
-          return element.from === '@vulcanize/util';
-        });
-
         if (importObject) {
           importObject.toImport.add('bigintTransformer');
         } else {
-          entityObject.imports.push(
-            {
-              toImport: new Set(['bigintTransformer']),
-              from: '@vulcanize/util'
-            }
-          );
+          importObject = {
+            toImport: new Set(['bigintTransformer']),
+            from: '@vulcanize/util'
+          };
+
+          entityObject.imports.push(importObject);
+        }
+      }
+
+      // Implement bigintArrayTransformer for array of bigint type.
+      if (column.tsType === 'bigint[]') {
+        column.columnOptions.push(
+          {
+            option: 'transformer',
+            value: 'bigintArrayTransformer'
+          }
+        );
+
+        if (importObject) {
+          importObject.toImport.add('bigintArrayTransformer');
+        } else {
+          importObject = {
+            toImport: new Set(['bigintArrayTransformer']),
+            from: '@vulcanize/util'
+          };
+
+          entityObject.imports.push(importObject);
+        }
+      }
+    });
+  }
+
+  _addDecimalTransformerOption (entityObject: any): void {
+    let importObject = entityObject.imports.find((element: any) => {
+      return element.from === '@vulcanize/util';
+    });
+
+    let isDecimalRequired = false;
+
+    entityObject.columns.forEach((column: any) => {
+      // Implement decimalTransformer for Decimal type.
+      if (column.tsType === 'Decimal') {
+        isDecimalRequired = true;
+
+        column.columnOptions.push(
+          {
+            option: 'transformer',
+            value: 'decimalTransformer'
+          }
+        );
+
+        if (importObject) {
+          importObject.toImport.add('decimalTransformer');
+        } else {
+          importObject = {
+            toImport: new Set(['decimalTransformer']),
+            from: '@vulcanize/util'
+          };
+
+          entityObject.imports.push(importObject);
+        }
+      }
+
+      // Implement decimalArrayTransformer for array of Decimal type.
+      if (column.tsType === 'Decimal[]') {
+        isDecimalRequired = true;
+
+        column.columnOptions.push(
+          {
+            option: 'transformer',
+            value: 'decimalArrayTransformer'
+          }
+        );
+
+        if (importObject) {
+          importObject.toImport.add('decimalArrayTransformer');
+        } else {
+          importObject = {
+            toImport: new Set(['decimalArrayTransformer']),
+            from: '@vulcanize/util'
+          };
+
+          entityObject.imports.push(importObject);
         }
       }
     });
+
+    if (isDecimalRequired) {
+      entityObject.imports.push(
+        {
+          toImport: new Set(['Decimal']),
+          from: 'decimal.js'
+        }
+      );
+    }
   }
 
   _addSubgraphColumns (subgraphTypeDefs: any, entityObject: any, def: any): any {

packages/codegen/src/schema.ts

@@ -198,6 +198,18 @@ export class Schema {
     });
     this._composer.addSchemaMustHaveType(typeComposer);
 
+    // Create a scalar type composer to add the scalar BigDecimal in the schema composer.
+    typeComposer = this._composer.createScalarTC({
+      name: 'BigDecimal'
+    });
+    this._composer.addSchemaMustHaveType(typeComposer);
+
+    // Create a scalar type composer to add the scalar Bytes in the schema composer.
+    typeComposer = this._composer.createScalarTC({
+      name: 'Bytes'
+    });
+    this._composer.addSchemaMustHaveType(typeComposer);
+
     // Create a type composer to add the type Proof in the schema composer.
     typeComposer = this._composer.createObjectTC({
       name: 'Proof',
@@ -243,19 +255,10 @@ export class Schema {
       }
     });
     this._composer.addSchemaMustHaveType(typeComposer);
-  }
-
-  /**
-   * Adds types 'ResultEvent' and 'WatchedEvent' to the schema.
-   */
-  _addEventsRelatedTypes (): void {
-    let typeComposer;
 
-    // Create Ethereum types.
     // Create the Block type.
-    const blockName = 'Block';
     typeComposer = this._composer.createObjectTC({
-      name: blockName,
+      name: '_Block_',
       fields: {
         cid: 'String!',
         hash: 'String!',
@@ -265,9 +268,17 @@ export class Schema {
       }
     });
     this._composer.addSchemaMustHaveType(typeComposer);
+  }
+
+  /**
+   * Adds types 'ResultEvent' and 'WatchedEvent' to the schema.
+   */
+  _addEventsRelatedTypes (): void {
+    let typeComposer;
 
+    // Create Ethereum types.
     // Create the Transaction type.
-    const transactionName = 'Transaction';
+    const transactionName = '_Transaction_';
     typeComposer = this._composer.createObjectTC({
       name: transactionName,
       fields: {
@@ -285,7 +296,7 @@ export class Schema {
       name: resultEventName,
       fields: {
         // Get type composer object for 'blockName' type from the schema composer.
-        block: () => this._composer.getOTC(blockName).NonNull,
+        block: () => this._composer.getOTC('_Block_').NonNull,
         tx: () => this._composer.getOTC(transactionName).NonNull,
         contract: 'String!',
         eventIndex: 'Int!',
@@ -326,7 +337,7 @@ export class Schema {
     const typeComposer = this._composer.createObjectTC({
       name: 'ResultIPLDBlock',
       fields: {
-        block: () => this._composer.getOTC('Block').NonNull,
+        block: () => this._composer.getOTC('_Block_').NonNull,
         contractAddress: 'String!',
         cid: 'String!',
         kind: 'String!',

packages/codegen/src/templates/database-template.handlebars

@@ -17,10 +17,8 @@ import { IPLDBlock } from './entity/IPLDBlock';
 
 {{#each queries as | query |}}
 import { {{query.entityName}} } from './entity/{{query.entityName}}';
-{{#unless @last}}
-
-{{/unless}}
 {{/each}}
+
 export class Database implements IPLDDatabaseInterface {
   _config: ConnectionOptions;
   _conn!: Connection;

packages/codegen/src/utils/subgraph.ts

@@ -4,11 +4,6 @@ import fs from 'fs';
 
 import { loadFilesSync } from '@graphql-tools/load-files';
 
-const SCALAR_MAPPING: any = {
-  BigDecimal: 'String',
-  Bytes: 'String'
-};
-
 export function parseSubgraphSchema (subgraphPath: string): any {
   const subgraphSchemaPath = path.join(path.resolve(subgraphPath), '/schema.graphql');
 
@@ -51,15 +46,7 @@ export function getFieldType (typeNode: any): { typeName: string, array: boolean
 
 function parseType (typeNode: any): any {
   // Check if 'NamedType' is reached.
-  if (typeNode.kind === 'NamedType') {
-    const typeName: string = typeNode.name.value;
-
-    // TODO Handle extra types provided by the graph.
-    // Replace unknown scalars using SCALAR_MAPPING.
-    if (typeName in SCALAR_MAPPING) {
-      typeNode.name.value = SCALAR_MAPPING[typeName];
-    }
-  } else {
+  if (typeNode.kind !== 'NamedType') {
     typeNode.type = parseType(typeNode.type);
   }
 

packages/codegen/src/utils/type-mappings.ts

@@ -33,12 +33,15 @@ _tsToPg.set('string', 'varchar');
 _tsToPg.set('number', 'integer');
 _tsToPg.set('bigint', 'numeric');
 _tsToPg.set('boolean', 'boolean');
+_tsToPg.set('Decimal', 'numeric');
 
 // Graphql to Typescript type-mapping.
 _gqlToTs.set('String', 'string');
 _gqlToTs.set('Int', 'number');
 _gqlToTs.set('BigInt', 'bigint');
 _gqlToTs.set('Boolean', 'boolean');
+_gqlToTs.set('BigDecimal', 'Decimal');
+_gqlToTs.set('Bytes', 'string');
 
 function getTsForSol (solType: string): string | undefined {
   return _solToTs.get(solType);