ScopesTreeView

public struct ScopesTreeView

A view on the scopes tree defined by row adapters.

For example:

// Define a tree of nested scopes
let adapter = ScopeAdapter([
    "foo": RangeRowAdapter(0..<1),
    "bar": RangeRowAdapter(1..<2).addingScopes([
        "baz" : RangeRowAdapter(2..<3)])])

// Fetch
let sql = "SELECT 1 AS foo, 2 AS bar, 3 AS baz"
let row = try Row.fetchOne(db, sql: sql, adapter: adapter)!

row.scopesTree.names  // ["foo", "bar", "baz"]

row.scopesTree["foo"] // [foo:1]
row.scopesTree["bar"] // [bar:2]
row.scopesTree["baz"] // [baz:3]

  • The scopes defined on this row, recursively.

    Declaration

    Swift

    public var names: Set<String> { get }
    Show on GitHub

  • Returns the row associated with the given scope.

    For example:

    let request = Book.including(required: Book.author)
let row = try Row.fetchOne(db, request)!

print(row)
// Prints [id:42 title:"Moby-Dick"]

let authorRow = row.scopesTree["author"]
print(authorRow)
// Prints [id:1 name:"Herman Melville"]

    Associated rows stored in nested associations are available, too:

    let request = Book.including(required: Book.author.including(required: Author.country))
let row = try Row.fetchOne(db, request)!

print(row)
// Prints [id:42 title:"Moby-Dick"]

let countryRow = row.scopesTree["country"]
print(countryRow)
// Prints [code:"US" name:"United States"]

    Nil is returned if the scope is not available.

    Declaration

    Swift

    public subscript(name: String) -> Row? { get }
    Show on GitHub