8e63ba89db
Implemented pagination in the blog to display 3 posts per page. This change allows users to navigate through posts using a pagination control at the bottom of the page. The pagination follows the pattern: << < 1 2 3 ... n > >>, enabling navigation to the first, previous, specific, next, or last pages. This improves user experience by preventing long scrolls on pages with many posts. Issue ID: FLAS-33
139 lines
3.7 KiB
Python
139 lines
3.7 KiB
Python
from flask import Blueprint
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from flask import flash
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from flask import g
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from flask import redirect
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from flask import render_template
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from flask import request
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from flask import url_for
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from werkzeug.exceptions import abort
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import markdown
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import math
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from .auth import login_required
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from .db import get_db
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bp = Blueprint("blog", __name__)
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@bp.route("/")
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def index():
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"""Show all the posts, most recent first."""
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db = get_db()
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page = request.args.get('page', 1, type=int)
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per_page = 3
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total_posts = db.execute("SELECT COUNT(*) FROM post").fetchone()[0]
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total_pages = math.ceil(total_posts / per_page)
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posts = db.execute(
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"SELECT p.id, title, body, created, author_id, username"
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" FROM post p JOIN user u ON p.author_id = u.id"
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" ORDER BY created DESC"
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" LIMIT ? OFFSET ?",
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(per_page, (page - 1) * per_page)
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).fetchall()
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# Convert markdown to HTML for each post body
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posts = [
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{**post, 'body': markdown.markdown(post['body'])} for post in posts
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]
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return render_template("blog/index.html", posts=posts, page=page, total_pages=total_pages)
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def get_post(id, check_author=True):
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"""Get a post and its author by id.
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Checks that the id exists and optionally that the current user is
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the author.
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:param id: id of post to get
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:param check_author: require the current user to be the author
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:return: the post with author information
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:raise 404: if a post with the given id doesn't exist
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:raise 403: if the current user isn't the author
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"""
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post = (
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get_db()
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.execute(
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"SELECT p.id, title, body, created, author_id, username"
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" FROM post p JOIN user u ON p.author_id = u.id"
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" WHERE p.id = ?",
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(id,),
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)
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.fetchone()
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)
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if post is None:
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abort(404, f"Post id {id} doesn't exist.")
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if check_author and post["author_id"] != g.user["id"]:
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abort(403)
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return post
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@bp.route("/create", methods=("GET", "POST"))
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@login_required
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def create():
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"""Create a new post for the current user."""
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if request.method == "POST":
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title = request.form["title"]
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body = request.form["body"]
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error = None
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if not title:
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error = "Title is required."
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if error is not None:
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flash(error)
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else:
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db = get_db()
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db.execute(
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"INSERT INTO post (title, body, author_id) VALUES (?, ?, ?)",
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(title, body, g.user["id"]),
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)
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db.commit()
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return redirect(url_for("blog.index"))
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return render_template("blog/create.html")
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@bp.route("/<int:id>/update", methods=("GET", "POST"))
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@login_required
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def update(id):
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"""Update a post if the current user is the author."""
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post = get_post(id)
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if request.method == "POST":
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title = request.form["title"]
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body = request.form["body"]
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error = None
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if not title:
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error = "Title is required."
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if error is not None:
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flash(error)
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else:
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db = get_db()
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db.execute(
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"UPDATE post SET title = ?, body = ? WHERE id = ?", (title, body, id)
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)
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db.commit()
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return redirect(url_for("blog.index"))
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return render_template("blog/update.html", post=post)
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@bp.route("/<int:id>/delete", methods=("POST",))
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@login_required
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def delete(id):
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"""Delete a post.
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Ensures that the post exists and that the logged in user is the
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author of the post.
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"""
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get_post(id)
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db = get_db()
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db.execute("DELETE FROM post WHERE id = ?", (id,))
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db.commit()
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return redirect(url_for("blog.index"))
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