def get_post(id, check_author=True):
post = get_db().execute(
'SELECT p.id, title, body, created, author_id, username'
' FROM post p JOIN user u ON p.author_id = u.id'
' WHERE p.id = ?', (id, )).fetchone()
if post is None:
#abort() will raise a special exception that returns an HTTP status code. It takes an optional message to show with the error, otherwise a default message is used. 404 means “Not Found”, and 403 means “Forbidden”. (401 means “Unauthorized”, but you redirect to the login page instead of returning that status.)
abort(404, "Post id {0} doesn't exist.".format(id))
#The check_author argument is defined so that the function can be used to get a post without checking the author. This would be useful if you wrote a view to show an individual post on a page, where the user doesn’t matter because they’re not modifying the post.
if check_author and post['author_id'] != g.user['id']:
abort(403)
return post
def create():
if request.method == 'POST':
title = request.form['title']
body = request.form['body']
error = None
if not title:
error = 'Title is required.'
if error is not None:
flash(error)
else:
db = get_db()
db.execute(
'INSERT INTO post (title, body, author_id)'
'VALUES (?,?,?)', (title, body, g.user['id']))
db.commit()
return redirect(url_for('blog.index'))
return render_template('blog/create.html')
def update(id):
post = get_post(id)
if request.method == 'POST':
title = request.form['title']
body = request.form['body']
error = None
if not title:
error = 'Title is required.'
if error is not None:
flash(error)
else:
db = get_db()
db.execute('UPDATE post SET title = ?, body= ?'
'WHERE id = ?', (title, body, id))
db.commit()
return redirect(url_for('blog.index'))
return render_template('blog/update.html', post=post)
def delete(id):
get_post(id)
db = get_db()
db.execute('DELETE FROM post WHERE id = ?', (id, ))
db.commit()
return redirect(url_for('blog.index'))
def index():
db = get_db()
posts = db.execute('SELECT p.id, title, body, created, author_id, username'
' FROM post p JOIN user u ON p.author_id = u.id'
' ORDER BY created DESC').fetchall()
return render_template('blog/index.html', posts=posts)