RowAdapter

public protocol RowAdapter : _RowAdapter

RowAdapter is a protocol that helps two incompatible row interfaces working together.

GRDB ships with four concrete types that adopt the RowAdapter protocol:

ColumnMapping: renames row columns
EmptyRowAdapter: hides all columns
RangeRowAdapter: exposes a range of columns
RenameColumnAdapter: transforms column names with a function
ScopeAdapter: defines row scopes
SuffixRowAdapter: hides the first columns of a row

To use a row adapter, provide it to any method that fetches:

let adapter = SuffixRowAdapter(fromIndex: 2)
let sql = "SELECT 1 AS foo, 2 AS bar, 3 AS baz"

// [baz:3]
try Row.fetchOne(db, sql: sql, adapter: adapter)

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                    addingScopes(_:)

Extension method

Returns an adapter based on self, with added scopes.

If self already defines scopes, the added scopes replace eventual existing scopes with the same name.

Declaration

Swift

public func addingScopes(_ scopes: [String : RowAdapter]) -> RowAdapter

Parameters


                                scopes

A dictionary that maps scope names to row adapters.

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