craban/server/services/store/post.go

package store

import (
	"database/sql"
	"fmt"

	sq "github.com/Masterminds/squirrel"

	"git.ctrlz.es/mgdelacroix/craban/model"
)

var postColumns = []string{"id", "user_id", "game_id", "createdat", "body"}

type PostStore struct {
	Conn *sql.DB
}

func NewPostStore(s *Store) *PostStore {
	return &PostStore{Conn: s.Conn}
}

func (ps *PostStore) Q() sq.StatementBuilderType {
	return sq.StatementBuilder.RunWith(ps.Conn)
}

func (ps *PostStore) postsFromRows(rows *sql.Rows) ([]*model.Post, error) {
	posts := []*model.Post{}

	for rows.Next() {
		var post model.Post

		err := rows.Scan(
			&post.ID,
			&post.UserID,
			&post.GameID,
			&post.CreatedAt,
			&post.Body,
		)
		if err != nil {
			return nil, err
		}

		posts = append(posts, &post)
	}

	return posts, nil
}

func (ps *PostStore) GetByID(id int) (*model.Post, error) {
	return ps.getPostByCondition(sq.Eq{"id": id})
}

func (ps *PostStore) getPostByCondition(condition sq.Eq) (*model.Post, error) {
	posts, err := ps.getPostsByCondition(condition)
	if err != nil {
		return nil, err
	}

	return posts[0], nil
}

func (ps *PostStore) getPostsByCondition(condition sq.Eq) ([]*model.Post, error) {
	rows, err := ps.Q().Select(postColumns...).
		From("posts").
		Where(condition).
		Query()
	if err != nil {
		return nil, fmt.Errorf("cannot get posts: %w", err)
	}
	defer rows.Close()

	posts, err := ps.postsFromRows(rows)
	if err != nil {
		return nil, fmt.Errorf("cannot get posts from rows: %w", err)
	}

	if len(posts) == 0 {
		return nil, sql.ErrNoRows
	}

	return posts, nil
}

func (ps *PostStore) Create(post *model.Post) (*model.Post, error) {
	query := ps.Q().Insert("posts").
		Columns(postColumns[1:]...).
		Values(post.UserID, post.GameID, post.CreatedAt, post.Body)

	res, err := query.Exec()
	if err != nil {
		return nil, fmt.Errorf("cannot insert post: %w", err)
	}

	id, err := res.LastInsertId()
	if err != nil {
		return nil, fmt.Errorf("cannot get last insert id for created post: %w", err)
	}

	return ps.GetByID(int(id))

}