def test_get_articles_by_date_with_non_existent_date(in_memory_repo):
target_date = date.fromisoformat('2020-03-06')
articles_as_dict, prev_date, next_date = news_services.get_articles_by_date(target_date, in_memory_repo)
# Check that there are no articles dated 2020-03-06.
assert len(articles_as_dict) == 0
def test_get_articles_by_date_with_one_date(in_memory_repo):
target_date = date.fromisoformat('2020-02-28')
articles_as_dict, prev_date, next_date = news_services.get_articles_by_date(target_date, in_memory_repo)
assert len(articles_as_dict) == 1
assert articles_as_dict[0]['id'] == 1
assert prev_date is None
assert next_date == date.fromisoformat('2020-02-29')
def test_get_articles_by_date_with_multiple_dates(in_memory_repo):
target_date = date.fromisoformat('2020-03-01')
articles_as_dict, prev_date, next_date = news_services.get_articles_by_date(target_date, in_memory_repo)
# Check that there are 3 articles dated 2020-03-01.
assert len(articles_as_dict) == 3
# Check that the article ids for the the articles returned are 3, 4 and 5.
article_ids = [article['id'] for article in articles_as_dict]
assert set([3, 4, 5]).issubset(article_ids)
# Check that the dates of articles surrounding the target_date are 2020-02-29 and 2020-03-05.
assert prev_date == date.fromisoformat('2020-02-29')
assert next_date == date.fromisoformat('2020-03-05')
def articles_by_date():
# Read query parameters.
target_date = request.args.get('date')
article_to_show_comments = request.args.get('view_comments_for')
# Fetch the first and last articles in the series.
first_article = services.get_first_article(uow.uow_instance)
last_article = services.get_last_article(uow.uow_instance)
if target_date is None:
# No date query parameter, so return articles from day 1 of the series.
target_date = first_article['date']
else:
# Convert target_date from string to date.
target_date = date.fromisoformat(target_date)
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)
# Fetch article(s) for the target date. This call also returns the previous and next dates for articles immediately
# before and after the target date.
articles, previous_date, next_date = services.get_articles_by_date(
target_date, uow.uow_instance)
first_article_url = None
last_article_url = None
next_article_url = None
prev_article_url = None
if len(articles) > 0:
# There's at least one article for the target date.
if previous_date is not None:
# There are articles on a previous date, so generate URLs for the 'previous' and 'first' navigation buttons.
prev_article_url = url_for('news_bp.articles_by_date',
date=previous_date.isoformat())
first_article_url = url_for('news_bp.articles_by_date',
date=first_article['date'].isoformat())
# There are articles on a subsequent date, so generate URLs for the 'next' and 'last' navigation buttons.
if next_date is not None:
next_article_url = url_for('news_bp.articles_by_date',
date=next_date.isoformat())
last_article_url = url_for('news_bp.articles_by_date',
date=last_article['date'].isoformat())
# Construct urls for viewing article comments and adding comments.
for article in articles:
article['view_comment_url'] = url_for(
'news_bp.articles_by_date',
date=target_date,
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=target_date.strftime('%A %B %e %Y'),
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)
# No articles to show, so return the homepage.
return redirect(url_for('home_bp.home'))
