Create Method: The create method creates new records. It takes a dictionary of values, applies any defaults we have specified and then inserts the record an returns the new ID.

New Method: Return a new record instance attached to the current environment and initialized with the provided `value`. The record is *not* created in database, it only exists in memory.

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Write Method:The write method updates existing records. It takes a dictionary of values and applies to all of the ids you pass. if you pass a list of ids, the values will be written to all ids. For updating a single record, pass a list of one entry, if you want to do different updates to the records, you have to do multiple write calls. You can also manage related fields with a write.

Update Method: Write do not work for records set which are not present in the database. Onchange method returns pseudo-records which do not exist in the database yet. So set record's field using update() method as calling write() method gives an undefined behavior.