array_type_field_filter: Adds 'contains' operator.

1. Adds filter for array type field.
2. From this operator filter you can search array type field.

Signed-off-by: shubhisood <[email protected]>

Author: shubhisood

lib/postgresql.js

@@ -522,6 +522,9 @@ PostgreSQL.prototype.buildExpression = function(columnName, operator,
       const regexOperator = operatorValue.ignoreCase ? ' ~* ?' : ' ~ ?';
       return new ParameterizedSQL(columnName + regexOperator,
         [operatorValue.source]);
+    case 'contains':
+      return new ParameterizedSQL(columnName + ' @> array[' + operatorValue.map((v) => `'${v}'`) + ']::'
+        + propertyDefinition.postgresql.dataType);
     default:
       // invoke the base implementation of `buildExpression`
       return this.invokeSuper('buildExpression', columnName, operator,

test/postgresql.test.js

@@ -263,6 +263,16 @@ describe('postgresql connector', function() {
       });
   });
 
+  it('should support where filter for array type field', async () => {
+    Post.dataSource.settings.allowExtendedOperators = true;
+    const post = await Post.find({where: {and: [
+      {
+        categories: {'contains': ['AA']},
+      },
+    ]}});
+    should.exist(post);
+    post.length.should.equal(1);
+  });
   it('should support boolean types with false value', function(done) {
     Post.create(
       {title: 'T2', content: 'C2', approved: false, created: created},