Model

1. Create simple model
2. Fields types
3. Table name
4. Mapping fields' names
5. Primary key

Create simple model

Simple model is a struct with supoorted types of fields. For example:

struct User {
    int id;
    std::string name;
    std::string email;
    std::string password;
    std::string created_at;
    std::string updated_at;
};

Fields types

Supported types of fields:

• int
• float
• double
• std::string

Table name

To override table name use table_name static field:

struct User {
    static constexpr const char* table_name = "users";
    int id;
    std::string name;
    std::string email;
    std::string password;
    std::string created_at;
    std::string updated_at;
};

Mapping fields' names

If you want to map fields' names to database columns' names use 'columns_names' static field with dictionary type ( e.g. std::map or std::unordered_map). Not all fields have to be mapped, those that are not mapped will be named the same as fields' names. For example:

struct User {
    static constexpr std::map<const char*, const char*> columns_names = {
        {"id", "user_id"},
        {"name", "user_name"},
        {"email", "user_email"},
        {"password", "user_password"},
        {"created_at", "user_created_at"},
        {"updated_at", "user_updated_at"}
    };
    int id;
    std::string name;
    std::string email;
    std::string password;
    std::string created_at;
    std::string updated_at;
};

Primary key

The default primary key is id field:

struct User {
    int id;
    std::string name;
    std::string email;
    std::string password;
    std::string created_at;
    std::string updated_at;
};

If you want to change primary key use id_columns static field with iterable type containing fields' names as std:: string (e.g. std::vector<std::string> or std::array<std::string>):

struct User {
    static constexpr std::array<std::string, 2> id_columns = {"id", "name"};
    int id;
    std::string name;
    std::string email;
    std::string password;
    std::string created_at;
    std::string updated_at;
};

You can also create model without primary key, just do not add id field:

struct User {
    std::string name;
    std::string email;
    std::string password;
    std::string created_at;
    std::string updated_at;
};

or use id_columns static field with empty iterable:

struct User {
    static constexpr std::array<std::string, 0> id_columns = {};
    std::string name;
    std::string email;
    std::string password;
    std::string created_at;
    std::string updated_at;
};