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As per the Mongoid Documentation, there are 16 valid field types:

Array
BigDecimal
Boolean
Date
DateTime
Float
Hash
Integer
BSON::ObjectId
BSON::Binary
Range
Regexp
String
Symbol
Time
TimeWithZone

To add a field (let's call it name and have it be a String), add this to our model file:

field :name, type: String

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Set a default value, just pass in the default option:

field :name, type: String, default: ""

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