Created ability to query specific colums #91
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See #90.
Modified .all method to accept attributes property to select single or multiple columns.
Example 1:
model.all({where : {name: 'bill'}, attributes: 'id'}}, callback)
OR
model.all({attributes: 'id'}}, callback)
returns array of ids (e.g. [ 1, 2 ]):
Example 2 :
model.all({where : {name: 'bill'}, attributes: ['id']}}, callback)
OR
model.all({attributes: ['id']}}, callback)
returns array of objects(e.g. [{id: 1}, {id: 2}]):
Example 3:
model.all({where: {address: '123'}, attributes: ['id', 'name']},callback)
OR
model.all({, attributes: ['id', 'name']},callback)
returns [{id: 1, name: 'bill'}, {id: 2. name: 'alice'}]: