group_join

group_by(self, inner_enumerable, outer_key=lambda x: x, inner_key=lambda x: x, result_func=lambda x: x)

Correlates the elements of two Enumerable collections based on key equality and groups the results. This is not an executing function.

Parameters

inner_enumerable : the Enumerable to join to the first collection outer_key : a lambda function to extract the join key from each element of the first collection inner_key : a lambda function to extract the join key from each element of the inner_enumerable. result_func : a lambda function to create a result element from an element of the first collection and a collection of matching elements from inner_enumerable

Returns

An Enumerable of elements of structure obtained by result_func.

Examples

from py_linq import Enumerable

Enumerable([
    {'value': 1},
    {'value': 2},
    {'value': 3}
]).group_join(
    Enumerable([1, 2, 3]),
    outer_key=lambda x: x['value'],
    inner_key=lambda x: x,
    result_func=lambda (x, y): {
        'inner': x,
        'outer': y.to_list()
    }
).to_list()
# [{'outer': [1], 'inner': {'value': 1}}, {'outer': [2], 'inner': {'value': 2}}, {'outer': [3], 'inner': {'value': 3}}]