feat: fetch index information for models

Signed-off-by: Muhammad Aaqil <[email protected]>

Author: aaqilniz

lib/datasource.js

@@ -1716,7 +1716,7 @@ DataSource.prototype.discoverSchemas = function(tableName, options, cb) {
 
     columns.forEach(function(item) {
       const propName = nameMapper('column', item.columnName);
-      schema.properties[propName] = {
+      const propertyDetails = {
         type: item.type,
         required: !item.generated && (item.nullable === 'N' || item.nullable === 'NO' ||
           item.nullable === 0 || item.nullable === false),
@@ -1727,12 +1727,25 @@ DataSource.prototype.discoverSchemas = function(tableName, options, cb) {
         scale: item.dataScale,
         generated: item.generated || false,
       };
+      if (
+        item.indexType === 'BTREE' &&
+        item.indexName !== 'PRIMARY' &&
+        !item.isForeignKey
+      ) {
+        propertyDetails.index = {unique: true};
+      }
+
       if (pks[item.columnName]) {
-        schema.properties[propName].id = pks[item.columnName];
+        propertyDetails.id = pks[item.columnName];
       }
-      if (uniqueKeys.includes(propName)) {
-        schema.properties[propName]['index'] = {unique: true};
+      if (
+        uniqueKeys.includes(propName) &&
+        propertyDetails['index'] === undefined
+      ) {
+        propertyDetails['index'] = {unique: true};
       }
+
+      schema.properties[propName] = propertyDetails;
       const dbSpecific = schema.properties[propName][dbType] = {
         columnName: item.columnName,
         dataType: item.dataType,

test/discovery.test.js

@@ -29,6 +29,7 @@ describe('Memory connector with mocked discovery', function() {
       owner: 'STRONGLOOP',
       tableName: 'INVENTORY',
       columnName: 'PRODUCT_ID',
+      indexType: 'BTREE',
       dataType: 'varchar',
       dataLength: 20,
       dataPrecision: null,
@@ -281,6 +282,9 @@ describe('Memory connector with mocked discovery', function() {
             scale: null,
             type: undefined,
             generated: true,
+            index: {
+              unique: true,
+            },
           },
           total: {
             length: null,