Конвертировать и массив объектов в другой формат путем объединения дубликатов

Question

Я пытался использовать существующие примеры карт и сокращать методы в javascript с большим трудом. Ниже я включил исходные данные и целевые данные. Я хотел бы преобразовать исходные данные в целевые данные. Может ли кто-нибудь помочь показать, как этого можно достичь, просто используя javascript?

Исходный формат

const source = [
    {
        id: 141,
        event: {
            id: 11,
            name: "Event 1",
            created: "2020-03-31T18:02:19+00:00",
            updated: "2020-04-01T14:05:13+00:00",
            status: {
                id: 2,
                name: "Work in progress"
            },
            dealer: {
                id: 1,
                name: "Dealer 1",
                logo: null,
                aws_endpoint: null,
                created: "2020-03-26T11:32:00+00:00",
                updated: "2020-04-01T14:42:50+00:00",
                status: {
                    id: 2,
                    name: "Work in progress"
                }
            },
            event_type: {
                id: 1,
                name: "VIP"
            },
            url: "https://eventone.com",
            vsms_url: "https://eventone.com",
            prefix: "https://eventone.com"
        },
        model: {
            id: 15,
            franchise: {
                id: 5,
                name: "Honda",
                logo: null,
                created: "2020-03-31T14:21:11+00:00",
                updated: "2020-03-31T14:21:11+00:00",
                status: {
                    id: 2,
                    name: "Work in progress"
                },
                franchise_models: [
                    null,
                    {
                        id: 8,
                        franchise: null,
                        name: "Jazz",
                        image: null
                    }
                ],
                branch: [
                    {
                        id: 19,
                        name: "Branch Four",
                        logo: null,
                        created: "2020-03-31T17:06:24+00:00",
                        updated: "2020-04-17T14:05:38+00:00",
                        status: {
                            id: 2,
                            name: "Work in progress"
                        },
                        dealer: {
                            id: 1,
                            name: "Dealer 1",
                            logo: null,
                            aws_endpoint: null,
                            created: "2020-03-26T11:32:00+00:00",
                            updated: "2020-04-01T14:42:50+00:00",
                            status: {
                                id: 2,
                                name: "Work in progress"
                            }
                        },
                        franchise: null,
                        address_1: null,
                        address_2: null,
                        address_3: null,
                        postcode: null,
                        telephone: null,
                        from_email: null,
                        to_email: null,
                        contact_email: "testemail@test.com"
                    }
                ]
            },
            name: "Civic",
            image: null
        }
    },
    {
        id: 142,
        event: {
            id: 11,
            name: "Event 1",
            created: "2020-03-31T18:02:19+00:00",
            updated: "2020-04-01T14:05:13+00:00",
            status: {
                id: 2,
                name: "Work in progress"
            },
            dealer: {
                id: 1,
                name: "Dealer 1",
                logo: null,
                aws_endpoint: null,
                created: "2020-03-26T11:32:00+00:00",
                updated: "2020-04-01T14:42:50+00:00",
                status: {
                    id: 2,
                    name: "Work in progress"
                }
            },
            event_type: {
                id: 1,
                name: "VIP"
            },
            url: "https://eventone.com",
            vsms_url: "https://eventone.com",
            prefix: "https://eventone.com"
        },
        model: {
            id: 8,
            franchise: {
                id: 5,
                name: "Honda",
                logo: null,
                created: "2020-03-31T14:21:11+00:00",
                updated: "2020-03-31T14:21:11+00:00",
                status: {
                    id: 2,
                    name: "Work in progress"
                },
                franchise_models: [
                    {
                        id: 15,
                        franchise: null,
                        name: "Civic",
                        image: null
                    },
                    null
                ],
                branch: [
                    {
                        id: 19,
                        name: "Branch Four",
                        logo: null,
                        created: "2020-03-31T17:06:24+00:00",
                        updated: "2020-04-17T14:05:38+00:00",
                        status: {
                            id: 2,
                            name: "Work in progress"
                        },
                        dealer: {
                            id: 1,
                            name: "Dealer 1",
                            logo: null,
                            aws_endpoint: null,
                            created: "2020-03-26T11:32:00+00:00",
                            updated: "2020-04-01T14:42:50+00:00",
                            status: {
                                id: 2,
                                name: "Work in progress"
                            }
                        },
                        franchise: null,
                        address_1: null,
                        address_2: null,
                        address_3: null,
                        postcode: null,
                        telephone: null,
                        from_email: null,
                        to_email: null,
                        contact_email: "testemail@test.com"
                    }
                ]
            },
            name: "Jazz",
            image: null
        }
    },
    {
        id: 143,
        event: {
            id: 11,
            name: "Event 1",
            created: "2020-03-31T18:02:19+00:00",
            updated: "2020-04-01T14:05:13+00:00",
            status: {
                id: 2,
                name: "Work in progress"
            },
            dealer: {
                id: 1,
                name: "Dealer 1",
                logo: null,
                aws_endpoint: null,
                created: "2020-03-26T11:32:00+00:00",
                updated: "2020-04-01T14:42:50+00:00",
                status: {
                    id: 2,
                    name: "Work in progress"
                }
            },
            event_type: {
                id: 1,
                name: "VIP"
            },
            url: "https://eventone.com",
            vsms_url: "https://eventone.com",
            prefix: "https://eventone.com"
        },
        model: {
            id: 9,
            franchise: {
                id: 6,
                name: "Volkswagen",
                logo: null,
                created: "2020-03-31T14:21:11+00:00",
                updated: "2020-03-31T14:21:11+00:00",
                status: {
                    id: 2,
                    name: "Work in progress"
                },
                franchise_models: [
                    {
                        id: 12,
                        franchise: null,
                        name: "Polo",
                        image: null
                    },
                    null
                ],
                branch: [
                    {
                        id: 19,
                        name: "Branch Four",
                        logo: null,
                        created: "2020-03-31T17:06:24+00:00",
                        updated: "2020-04-17T14:05:38+00:00",
                        status: {
                            id: 2,
                            name: "Work in progress"
                        },
                        dealer: {
                            id: 1,
                            name: "Dealer 1",
                            logo: null,
                            aws_endpoint: null,
                            created: "2020-03-26T11:32:00+00:00",
                            updated: "2020-04-01T14:42:50+00:00",
                            status: {
                                id: 2,
                                name: "Work in progress"
                            }
                        },
                        franchise: null,
                        address_1: null,
                        address_2: null,
                        address_3: null,
                        postcode: null,
                        telephone: null,
                        from_email: null,
                        to_email: null,
                        contact_email: "testemail@test.com"
                    }
                ]
            },
            name: "fdsfdsfdsfdsf",
            image: null
        }
    },
    {
        id: 144,
        event: {
            id: 11,
            name: "Event 1",
            created: "2020-03-31T18:02:19+00:00",
            updated: "2020-04-01T14:05:13+00:00",
            status: {
                id: 2,
                name: "Work in progress"
            },
            dealer: {
                id: 1,
                name: "Dealer 1",
                logo: null,
                aws_endpoint: null,
                created: "2020-03-26T11:32:00+00:00",
                updated: "2020-04-01T14:42:50+00:00",
                status: {
                    id: 2,
                    name: "Work in progress"
                }
            },
            event_type: {
                id: 1,
                name: "VIP"
            },
            url: "https://eventone.com",
            vsms_url: "https://eventone.com",
            prefix: "https://eventone.com"
        },
        model: {
            id: 4,
            franchise: {
                id: 6,
                name: "Volkswagen",
                logo: null,
                created: "2020-03-31T14:21:11+00:00",
                updated: "2020-03-31T14:21:11+00:00",
                status: {
                    id: 2,
                    name: "Work in progress"
                },
                franchise_models: [
                    {
                        id: 13,
                        franchise: null,
                        name: "Golf",
                        image: null
                    },
                    null
                ],
                branch: [
                    {
                        id: 19,
                        name: "Branch Four",
                        logo: null,
                        created: "2020-03-31T17:06:24+00:00",
                        updated: "2020-04-17T14:05:38+00:00",
                        status: {
                            id: 2,
                            name: "Work in progress"
                        },
                        dealer: {
                            id: 1,
                            name: "Dealer 1",
                            logo: null,
                            aws_endpoint: null,
                            created: "2020-03-26T11:32:00+00:00",
                            updated: "2020-04-01T14:42:50+00:00",
                            status: {
                                id: 2,
                                name: "Work in progress"
                            }
                        },
                        franchise: null,
                        address_1: null,
                        address_2: null,
                        address_3: null,
                        postcode: null,
                        telephone: null,
                        from_email: null,
                        to_email: null,
                        contact_email: "testemail@test.com"
                    }
                ]
            },
            name: "fdsfdsfdsfdsf",
            image: null
        }
    }
];

(*** Обратите внимание) В целевых данных :

Дублирующиеся франшизы объединяются по id. Модели франшизы объединены во множество моделей франшизы. ** Также обратите внимание, что нулевые значения в исходном franchise_models больше не находятся в целевом franchise_models.

Целевой формат

const target = [{
    franchise_id: 5,
    franchise_name: "Honda",
    franchise_models: [{
        id: 15,
        franchise: null,
        name: "Civic",
        image: null
    },
    {
        id: 8,
        franchise: null,
        name: "Jazz",
        image: null
    }],
    branch: [
        {
            id: 19,
            name: "Branch Four",
            logo: null,
            created: "2020-03-31T17:06:24+00:00",
            updated: "2020-04-17T14:05:38+00:00",
            status: {
                id: 2,
                name: "Work in progress"
            },
            dealer: {
                id: 1,
                name: "Dealer 1",
                logo: null,
                aws_endpoint: null,
                created: "2020-03-26T11:32:00+00:00",
                updated: "2020-04-01T14:42:50+00:00",
                status: {
                    id: 2,
                    name: "Work in progress"
                }
            },
            franchise: null,
            address_1: null,
            address_2: null,
            address_3: null,
            postcode: null,
            telephone: null,
            from_email: null,
            to_email: null,
            contact_email: "testemail@test.com"
        }
    ]
}, {
    franchise_id: 6,
    franchise_name: "Vauxhall",
    franchise_models: [{
        id: 12,
        franchise: null,
        name: "Polo",
        image: null
    },
    {
        id: 13,
        franchise: null,
        name: "Golf",
        image: null
    }],
    branch: [
        {
            id: 19,
            name: "Branch Four",
            logo: null,
            created: "2020-03-31T17:06:24+00:00",
            updated: "2020-04-17T14:05:38+00:00",
            status: {
                id: 2,
                name: "Work in progress"
            },
            dealer: {
                id: 1,
                name: "Dealer 1",
                logo: null,
                aws_endpoint: null,
                created: "2020-03-26T11:32:00+00:00",
                updated: "2020-04-01T14:42:50+00:00",
                status: {
                    id: 2,
                    name: "Work in progress"
                }
            },
            franchise: null,
            address_1: null,
            address_2: null,
            address_3: null,
            postcode: null,
            telephone: null,
            from_email: null,
            to_email: null,
            contact_email: "testemail@test.com"
        }
    ]
}]