Transform Functions

Transform functions are used to extract and/or reformat data returned by a hydrate function into the desired type/format for a column. You can call your own transform function with From, but you probably don't need to write one -- The SDK provides many that cover the most common cases. You can chain transforms together, but the transform chain must be started with a From function:

Name	Description
`FromConstant`	Return a constant value (specified by 'param').
`FromField`	Generate a value by retrieving a field from the source item.
`FromValue`	Generate a value by returning the raw hydrate item.
`FromCamel`	Generate a value by converting the given field name to camel case and retrieving from the source item.
`FromGo`	Generate a value by converting the given field name to camel case and retrieving from the source item.
`From`	Generate a value by calling a 'transformFunc'.
`FromJSONTag`	Generate a value by finding a struct property with the json tag matching the column name.
`FromTag`	Generate a value by finding a struct property with the tag 'tagName' matching the column name.
`FromP`	Generate a value by calling 'transformFunc' passing param.

Additional functions can be chained after a From function to transform the data:

Name	Description
`Transform`	Apply an arbitrary transform to the data (specified by 'transformFunc').
`TransformP`	Apply an arbitrary transform to the data, passing a parameter.
`NullIfEqual`	If the input value equals the transform param, return nil.
`NullIfZero`	If the input value equals the zero value of its type, return nil.