TopShot_createCollection.cdc

transaction {

    prepare(acct: AuthAccount) {
    
        // First, check to see if a moment collection already exists
        if acct.borrow<&TopShot.Collection>(from: /storage/MomentCollection) == nil {
        
            // create a new TopShot Collection
            let collection <- TopShot.createEmptyCollection() as! @TopShot.Collection

            // Put the new Collection in storage
            acct.save(<-collection, to: /storage/MomentCollection)

            // create a public capability for the collection
            acct.link<&{TopShot.MomentCollectionPublic}>(/public/MomentCollection, target: /storage/MomentCollection)
        }
    }
}