query/demo/sandbox.cpp

#include "matador/object/schema.hpp"

#include "matador/logger/log_manager.hpp"

#include "author.hpp"
#include "book.hpp"
#include "recipe.hpp"

#include <iostream>

/*
 *  node author
 *
 *  relation_endpoints
 *      1. - field_name "books"
 *         - type "has_many"
 *         - node <author>
 *         - foreign endpoint (1) "author"
 *
 *  node book
 *      2. - field_name "author_id"
 *         - type "belongs_to"
 *         - node <book>
 *         - foreign endpoint (2) "books"
 *
 *  Attach process:
 *
 *  attach<author>
 *  - relation completer detects "has_many<book>"
 *  - has_many<book> doesn't find <book> (not yet attached)
 *  - create endpoint (1) without foreign endpoint
 *  - create node many_to_many_relation<author, book>("author_id", "id")
 *  - 3. create endpoint
 *      - field name "author_id"
 *      - type "belongs_to"
 *      - node <many_to_many_relation<author, book>>
 *      - foreign endpoint (1) "author
 *  - set foreign endpoint of (1) to endpoint (3)
 *  - register endpoint in authors node by type book
 *  - attach (internal) node<many_to_many_relation<author, book>>
 *
 *  attach<book>
 *  - relation completer detects "belongs_to<author>"
 *  - belongs_to<author> finds <book>
 *  - try to find relation endpoint of type book in authors node
 *  - if endpoint was found
 *    - validate node in endpoint
 *    - if node is of type many_to_many_relation
 *      - detach node of endpoint
 *      - update node in endpoint to <book>
 *  - else
 *    - create endpoint <book> (1)
 *    - create endpoint <author> (2)
 *    - set foreign endpoint of (1) to endpoint (2)
 *    - set foreign endpoint of (2) to endpoint (1)
 *  - check relation endpoints...
 */

namespace demo {
struct names {
    unsigned int id{};
    std::vector<std::string> names_list;

    template<typename Operator>
    void process(Operator &op) {
        namespace field = matador::access;
        field::primary_key( op, "id", id );
        field::has_many(op, "name_list", names_list, "names_id", matador::utils::fetch_type::EAGER);
    }
};

struct user;
struct profile {
    unsigned int id{};
    std::string first_name;
    std::string last_name;
    matador::object::object_ptr<demo::user> user;

    template<typename Operator>
    void process(Operator &op) {
        namespace field = matador::access;
        field::primary_key( op, "id", id );
        field::attribute( op, "first_name", first_name, 255 );
        field::attribute( op, "last_name", last_name, 255 );
        field::belongs_to( op, "user_id", user, matador::utils::default_foreign_attributes );
    }
};
struct user {
    unsigned int id{};
    std::string username;
    matador::object::object_ptr<demo::profile> profile;

    template<typename Operator>
    void process(Operator &op) {
        namespace field = matador::access;
        field::primary_key( op, "id", id );
        field::attribute( op, "username", username, 255 );
        field::has_one(op, "profile_id", profile, matador::utils::default_foreign_attributes );
    }
};
}

using namespace demo;
using namespace matador;

int main() {
  logger::default_min_log_level(logger::log_level::LVL_DEBUG);
  logger::add_log_sink(logger::create_stdout_sink());

  {
    // has_many with builtin-type
    object::schema schema;

    auto result = schema.attach<names>("names");

    schema.dump(std::cout);
  }
  {
    // has_many to belongs_to
    object::schema schema;

    auto result = schema.attach<author>("authors")
        .and_then([&schema] { return schema.attach<book>("books"); });

    schema.dump(std::cout);
  }
  {
    // belongs_to to has_many
    object::schema schema;

    auto result = schema.attach<book>("books")
        .and_then([&schema] { return schema.attach<author>("authors"); });

    schema.dump(std::cout);
  }
  {
    // has_many_to_many (with join columns first)
    object::schema schema;

    auto result = schema.attach<demo::ingredient>("ingredients")
        .and_then([&schema] { return schema.attach<recipe>("recipes"); });

    schema.dump(std::cout);
  }
  {
    // has_many_to_many (with join columns last)
    object::schema schema;

    auto result = schema.attach<demo::recipe>("recipes")
        .and_then([&schema] { return schema.attach<ingredient>("ingredients"); });

    schema.dump(std::cout);
  }
  {
    // belongs_to to has_one
    object::schema schema;

    auto result = schema.attach<profile>("profiles")
        .and_then([&schema] { return schema.attach<user>("users"); });

    schema.dump(std::cout);
  }
  {
    // has_one to belongs_to
    object::schema schema;

    auto result = schema.attach<user>("users")
        .and_then([&schema] { return schema.attach<profile>("profiles"); });

    schema.dump(std::cout);
  }
}