def test_get_articles_by_id(in_memory_repo):
target_article_ids = [5, 6, 7, 8]
articles_as_dict = news_services.get_articles_by_id(target_article_ids, in_memory_repo)
# Check that 2 articles were returned from the query.
assert len(articles_as_dict) == 2
# Check that the article ids returned were 5 and 6.
article_ids = [article['id'] for article in articles_as_dict]
assert set([5, 6]).issubset(article_ids)
def articles_by_tag():
articles_per_page = 3
# Read query parameters.
tag_name = request.args.get('tag')
cursor = request.args.get('cursor')
article_to_show_comments = request.args.get('view_comments_for')
if article_to_show_comments is None:
# No view-comments query parameter, so set to a non-existent article id.
article_to_show_comments = -1
else:
# Convert article_to_show_comments from string to int.
article_to_show_comments = int(article_to_show_comments)
if cursor is None:
# No cursor query parameter, so initialise cursor to start at the beginning.
cursor = 0
else:
# Convert cursor from string to int.
cursor = int(cursor)
# Retrieve article ids for articles that are tagged with tag_name.
article_ids = services.get_article_ids_for_tag(tag_name, uow.uow_instance)
# Retrieve the batch of articles to display on the Web page.
articles = services.get_articles_by_id(
article_ids[cursor:cursor + articles_per_page], uow.uow_instance)
first_article_url = None
last_article_url = None
next_article_url = None
prev_article_url = None
if cursor > 0:
# There are preceding articles, so generate URLs for the 'previous' and 'first' navigation buttons.
prev_article_url = url_for('news_bp.articles_by_tag',
tag=tag_name,
cursor=cursor - articles_per_page)
first_article_url = url_for('news_bp.articles_by_tag', tag=tag_name)
if cursor + articles_per_page < len(article_ids):
# There are further articles, so generate URLs for the 'next' and 'last' navigation buttons.
next_article_url = url_for('news_bp.articles_by_tag',
tag=tag_name,
cursor=cursor + articles_per_page)
last_cursor = articles_per_page * int(
len(article_ids) / articles_per_page)
if len(article_ids) % articles_per_page == 0:
last_cursor -= articles_per_page
last_article_url = url_for('news_bp.articles_by_tag',
tag=tag_name,
cursor=last_cursor)
# Construct urls for viewing article comments and adding comments.
for article in articles:
article['view_comment_url'] = url_for('news_bp.articles_by_tag',
tag=tag_name,
cursor=cursor,
view_comments_for=article['id'])
article['add_comment_url'] = url_for('news_bp.comment_on_article',
article=article['id'])
# Generate the webpage to display the articles.
return render_template('news/articles.html',
title='Articles',
articles_title='Articles tagged by ' + tag_name,
articles=articles,
selected_articles=utilities.get_selected_articles(
len(articles) * 2),
tag_urls=utilities.get_tags_and_urls(),
first_article_url=first_article_url,
last_article_url=last_article_url,
prev_article_url=prev_article_url,
next_article_url=next_article_url,
show_comments_for_article=article_to_show_comments)