Create KnexProcessor for easy DB CRUD operations about kurier

[joelalejandro]

Pseudocode:

import Knex from "knex";

// type should be static on Resource
type Resource = {};
class OperationProcessor<T> {}

class KnexProcessor<T extends Resource> extends OperationProcessor<T> { 
    constructor(public knex: KnexOptions) {
        super();
        this.knex = new Knex(knex);
    }

    async get(filters?: {}): Promise<T[]> {
        const tableName = this.typeToTableName(data);

        if (filters.id) {
            return await this.knex(tableName)
                .select()
                .where(
                    { id: filters.id }
                );
        }
        
        return await this.knex(tableName)
            .select()
            .where(this.filtersToKnex(filters));
    }

    async add(data: T): Promise<T> {
        const tableName = this.typeToTableName(data);
        
        return await this.knex(tableName).insert(data.attributes);
    }   
    
    async remove(): void {

    }

    async update(data: T): Promise<T> {

    }

    private typeToTableName(data: T): string {
        // T.name()
        // return "foo";

        return data.type;
    }
}