fix(GridFS): fix TypeError: doc.data.length is not a function #1570
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This is a port of #1555 to 3.0.0 branch.
When using the promoteBuffers connect option,
doc.data
is already a node.js Buffer.So trying to call
length()
like forBSON.Binary
fails.Fixed simply by checking
Buffer.isBuffer(doc.data)
type.