app\main\views(6).py

#...
from .forms import EditProfileForm, EditProfileAdminForm, CollectionForm, ContentForm
from ..models import User, Role, Collection, Permission, Content

#...
@main.route('/content/<int:id>', methods=['GET'])
def get_content(id):
    content = Content.query.get_or_404(id)
    return render_template('content.html', content=content, author=content.collection.author)


@main.route('/new-content/', methods=['GET', 'POST'])
@login_required
def new_content():
    form = ContentForm()
    form.collection.choices = [(c.id, c.name) for c in current_user.collections]
    if current_user.can(Permission.WRITE) and form.validate_on_submit():
        collection = Collection.query.get_or_404(form.collection.data)
        if collection.has_content(form.url.data):
            flash('That link is already in this Collection!')
            return redirect(url_for('.new_content'))
        content = Content(title=form.title.data,
                          url=form.url.data,
                          description=form.description.data,
                          collection=collection)
        db.session.add(content)
        db.session.commit()
        if content.add_to_stream():
            flash("Your Content has been added!")
            return redirect(url_for('.get_content', id=content.id))
        else:
            db.session.delete(content)
            db.session.commit()
            flash("An error occurred, please try again")
            return redirect(url_for('.new_content'))
    return render_template('new_content.html', form=form)


@main.route('/edit-content/<int:id>', methods=['GET', 'POST'])
@login_required
def edit_content(id):
    content = Content.query.get_or_404(id)
    if current_user != content.collection.author and \
            not current_user.can(Permission.ADMIN):
        abort(403)
    form = ContentForm()
    form.collection.choices = [(c.id, c.name) for c in current_user.collections]
    if form.validate_on_submit():
        collection = Collection.query.get_or_404(form.collection.data)
        if content.url != form.url.data and collection.has_content(form.url.data):
            flash('That link is already in this Collection!')
            return redirect(url_for('.edit_content', id=id))

        # Update Database
        content.title = form.title.data
        content.description = form.description.data
        content.url = form.url.data
        content.collection = collection
        db.session.commit()
        if content.update_stream():
            return redirect(url_for('.get_content', id=id))
    form.title.data = content.title
    form.description.data = content.description
    form.url.data = content.url
    return render_template('edit_content.html', content=content, form=form)


@main.route('/delete-content/<int:id>', methods=['GET', 'POST'])
@login_required
def delete_content(id):
    content = Content.query.get_or_404(id)
    if current_user != content.collection.author and \
            not current_user.can(Permission.ADMIN):
        abort(403)
    if content.delete_from_stream():
        db.session.delete(content)
        db.session.commit()
        flash('Your Content has been deleted.')
        return redirect(url_for('.index'))
    else:
        flash('An error occurred, please try again.')
        return redirect(url_for('.edit_content', id=id))