I'm new to Python and I'm trying to make a simple bulletin board system app using web2py. I am trying to add a post into a certain board and I linked the post and board by including the following field in my post table: Field('board_id', db.board). When I try to create a post inside a particular board it gives me an error: "OperationalError: no such column: board.id". My code for create_posts:
def add_post():
board = db.board(request.args(0))
form = SQLFORM(db.post)
db.pst.board_id.default = db.board.id
if form.process().accepted:
session.flash = T('The data was inserted')
redirect(URL('default', 'index'))
return dict(form=form, board=board)
When I try to do {{=board}} on the page that shows the posts in a certain board, I get Row {'name': 'hi', 'id': 1L, 'pst': Set (pst.board_id = 1), 'description': 'hi'} so I know it's there in the database. But when I do the same thing for the "add post" form page, it says "board: None". I'm extremely confused, please point me in the right direction!
There appear to be several problems with your function. First, you are assigning the default value of the board_id field to be a Field object (i.e., db.board.id) rather than an actual id value (e.g., board.id). Second, any default values should be assigned before creating the SQLFORM.
Finally, you pass db.post to SQLFORM, but in the next line, the post table appears to be called db.pst -- presumably these are not two separate tables and one is just a typo.
Regarding the issue of {{=board}} displaying None, that indicates that board = db.board(request.args(0)) is not retrieving a record, which would be due to request.args(0) itself being None or being a value that does not match any record id in db.board. You should check how you are generating the links that lead to add_post and confirm that there is a valid db.board id in the first URL arg. In any case, it might be a good idea to detect when there is no valid board record and either redirect or display an error message.
So, your function should look something like this:
def add_post():
board = db.board(request.args(0)) or redirect(URL('default', 'index'))
db.pst.board_id.default = board.id
form = SQLFORM(db.pst)
if form.process(next=URL('default', 'index'),
message_onsuccess=T('The data was inserted'))
return dict(form=form, board=board)
Note, if your are confident that links to add_post will include valid board IDs, then you can eliminate the first line altogether, as there is no reason to retrieve a record based on its ID if the only field you need from it is the ID (which you already have). Instead, the second line could be:
db.pst.board_id.default = request.args(0) or redirect(URL('default', 'index'))
Related
I have been working with Flask for a little while and developed a database manager application for managing internal data for the department I work in (I am not a "real" developer but have learned by doing/necessity). The application works great as a basic CRUD app. In it I have used Flask forms and tables including the LinkCol column for linking to different functions within the app. In those cases, I am using an 'Edit' or 'Delete' clickable link; meaning every column in the table has an extra cell with that word. Clicking either of those takes the user to the corresponding page where they can take appropriate action on that item.
Currently I am trying to use LinkCol so that data returned from the database can be the clickable link that links to another function rather than every table having an additional column (for example, "Go to Account"). So, when my table populates with an account number, the user can click the actual account number in the table to go to a different page to view additional data about that specific account. I read the docs and looked at the examples on the creators page regarding overwriting things in the classes but haven't been able to figure it out. I have written a few of my own classes, but am not an expert on the matter by any means. I also have been unable to find anything else that might help including on SO which is always my go to resource for figuring things out.
Here is my table definition using a LinkCol that renders incorrectly and puts 'Account #' in each cell instead of the dynamic data I would like. Changing to Col gives correct display but I want it to be clickable:
class AccountsResults(MainTable):
AccNo = LinkCol('Account #','dbhome_bp.route.account_detail', url_kwargs=
dict(AccNo='AccNo',StatusCode='Active',ServiceAddress1=\
'ServiceAddress1'))
TnCount = Col('Total TNs')
ServiceAddress1 = Col('Service Address')
ServiceCity = Col('Service City')
ServiceZip = Col('Service Zip Code')
MasterServiceDate = Col('Master Service Date')
Active = Col('Currently Active')
Here is an example of what I know I can do versus what I would like to do.
Can do ('Go To Account' is clickable in the Go To Account column):
Go To Account
Account #
Service Address
Etc.
Go To Account
12345678
1234 Anywhere
Yup
Go To Account
12345679
5678 Somewhere
Nah
Would like to do (Account numbers are clickable in Account # column ):
Account #
Service Address
Etc.
12345678
1234 Anywhere
Yup
12345679
5678 Somewhere
Nah
Does anyone know how to make the dynamic data returned from a query the clickable link for a LinkCol in Flask Table?
Any help is greatly appreciated.
Assuming an Sqlalchemy model Account with PK column id and a route defined as follows:
accounts = Blueprint('accounts', __name__)
#accounts.route("/accounts/<int:account_id>")
def detail(self, account_id):
_account = Account.get_or_404(account_id)
# show account details
return render('account-details.html', account=_account)
Define your account link column as follows:
account = LinkCol(
name='Account #',
attr='id',
endpoint='accounts.detail',
url_kwargs=dict(account_id='id'),
)
The parameter meanings are as follows:
name # the column header text
attr # the name of the attribute of the account object to render as the text in the <td> cell
endpoint # the endpoint to link to
url_kwargs # the arguments that get passed to the url_for function along with the endpoint
The links would be constructed as if you had done a url_for for each row in the table as follows:
_row_account_detail_url = url_for('accounts.detail', account_id=row_id)
Example Table definition:
class AccountTable(Table):
account = LinkCol(
name='Account #',
attr='id',
endpoint='accounts.detail',
url_kwargs=dict(account_id='id'),
)
service_address = Col(
'Service Address',
attr='service_address'
)
# other columns
I have a Flask application and need to store users' place when they navigate the content.
For example, I have a route like this: #main_bp.route('/articles/<category>/<article_number>', defaults={'category': 'new'})
The content is organized such that you page through articles under a category: starting at 0, then 1, and so forth. The URL for article number 3 would look like: articles/<category>/3
I'd like to save users' place so that if they leave the site after visiting article 3, when they navigate to the articles page they'll land on articles/<category>/3, rather than articles/<category>/0.
What is the best way to achieve this? Currently, I've modeled the data in the database so there is a column that looks like category_article_last_visited (integer). I'm able to store this data as a user browses the site, but I'm not sure how to retrieve it when they return to the articles page.
What I've tried:
#main_bp.route('/articles/<category>/<article_number>', defaults={'category': 'new', 'article_number':current_user.category_article_last_visited}), but I get an error that there is no such attribute.
Checking current_user.category_article_last_visited in the routes function and using the article number. This renders the correct content, but doesn't change the URL, which won't work.
Redirecting users if they have a value for current_user.category_article_last_visited. This doesn't seem to yield any change.
I am curious if storing in the db (assigning the value, db.commit(), etc.) is the right path, or if I should explore flask-sessions more. I need this information to persist across sessions, so that if a user logs out, clears cookies, uses a different device, etc. it is still available. I may also perform analytics on these values in the future.
Is the method I've described above the best way to achieve this? Is flask-sessions or something else preferable?
If the method outlined above is best, how do I correctly route this information so that users are directed to the page they left off, and the URL is changed appropriately?
Thanks
I would go with the redirect solution, it is more clear.
I would add an if statement at the beginning of the route-function and if there is data for this user, i would redirect to that page. For example:
#main_bp.route('/articles/<category>/<article_number>', defaults={'category': 'new'})
def routefunc():
if current_user.category_article_last_visited !=0: #or whatever your column keeps for empty data
return redirect ('/articles/'+yourcategory +'/'+ current_user.category_article_last_visited #as string
This must be combined with some other functionality, to avoid infinitive redirection to this route:
Option 1:
You can add another variable in the route that will have specific value on these redirections and will ignore this if statement. For example:
#main_bp.route('/articles/<category>/<article_number>/<check>', defaults={'category': 'new'})
def routefunc():
if current_user.category_article_last_visited !=0 and check!=1: return redirect ('/articles/'+yourcategory +'/'+ current_user.category_article_last_visited+'/1')
However in this case you must add this variable (with some other value different from 1) to all of your urls-hrefs etc and it will make your urls more "dirty". It would be effective for a small app, but i would avoid it for a big app/website with multiple internal links.
Option 2:
You could add one more column in your database table that will be 1/0 depending on when user visitis this route, directly or from redirection. In this case you must add a couple of queries to check and/or update this value before-after redirection.
Option 3:
You could create another similar route that will only handle redirections, and produce the same results (same html) but without the if statement. For example:
#main_bp.route('/articles/<category>/<article_number>', defaults={'category': 'new'})
def routefunc():
if current_user.category_article_last_visited !=0: #or whatever your column keeps for empty data
return redirect ('/articles2/'+yourcategory +'/'+ current_user.category_article_last_visited #as string
#main_bp.route2('/articles2/<category>/<article_number>', defaults={'category': 'new'})
def routefunc():
return ('yourhtml.html')
***Session based approach is not good here, as you want a long term solution.
As you probably have many categories, articles, users, you would better create a separate table specifically for this
I don't know what is the best way to achieve what you want but here's what you could try. Assuming you want to perform some analytics on the data you might want to store it in a database.
You could have a route designed to create a user cookie when a new user visits your page and redirects him to the articles page with the new cookie set:
#main_bp.route('/articles/set_cookie', "GET"])
def set_article_cookie():
sessionserializer = securecookiesessioninterface().get_signing_serializer(main_bp)
tempcookie = sessionserializer.dumps(dict(session))
resp = make_response(redirect('/articles'))
resp.set_cookie("user", tempcookie)
return resp
And your existing route in which you check if the user has already visited the page. In which case you will want to check in the database what was the last article he read and redirect him accordingly:
#main_bp.route('/articles/<category>/<article_number>', defaults={'category': 'new'})
def articles(category, article_number):
# If the user cookie is already set, check if there is some data is the database and redirect to his last article visited
cookie = request.cookies
if "user" in cookie:
# Retreive the user cookie value and check the database for this value
return redirect('/articles/' + last_article_visited)
# Else redirect the user to set_article_cookie
else:
return redirect("/set_article_cookie")
OK, here is the solution I decided on:
I update the paths of nav links throughout the site, so instead of /articles/<category>/0 it's /articles/<category>/current_user.article_number_last_visited
Since not all users have visited articles in every category, I added default routing logic, similar to:
#main_bp.route('/articles/<category>/', defaults={'article_number': 0})
#main_bp.route('/articles/<category>/<article_number>', methods=['GET', 'POST'])
This routes users correctly even if current_user.article_number is null.
I believe this will also work if the user is not logged in (and therefore there will be no article_number attribute). I haven't checked this case out thoroughly though because in my use case users have to be logged in to view content.
I need a help please.
So I wanted when I change the Internal Category (field name is categ_id) value to 500 final product,
and then the Routes field changes to :
Manufacture checked,
Make To Order checked,
Buy checked
and also the Value of Tracking field is changes as well to:
By Lots checked
How can I do that? Any suggestion ? Or my is it my question are not clear enough ?
Sorry for asking , I never done this before so yeah kind a confusing.
Here I got the picture the interface and the information about the field as well.
Routes field name
Tracking field name
Please anyone kindly to help me. I am so confused.
You could achieve this by using api onchange in Odoo 9.
#api.onchange('categ_id')
def onchange_categ_id(self):
for record in self:
# I prefer to check by id, but here I show how to check by string name in case you want it
if record.categ_id.name == '500 final product':
# because route_ids is many2many field,
# you need special commands to change the value
# here I use (6, _, ids) to set value.
# But before that, you have to get the ids of the routes you want from model stock.location.route
# (you could use search method to get the ids)
record.route_ids = [(6,0, list_of_id)]
record.tracking = 'lot'
...
You could refer to Odoo Doc to learn more about O2m and M2m commands
I am working on a project where I scrape a number of blogs, and save a selection of the data to a SQLite database. Such as the title of the post, the date it was posted, and the content of the post.
The goal in the end is to do some fancy textual analyses, but right now I have a problem with writing the data to the database.
I work with the library pattern for Python. (the module about databases can be found here)
I am busy with the third blog now. The data from the two other blogs is already saved in the database, and for the third blog, which is similarly structured, I adapted the code.
There are several functions well integrated with each other, they work fine. I also got access to all the data the right way, when I try it out in IPython Notebook it works fine. When I ran the code as a trial in the Console for only one blog page (it has 43 altogether), it also worked and saved everything nicely in the database. But when I ran it again for 43 pages, it threw a data error.
There are some comments and print statements inside the functions now which I used for debugging. The problem seems to happen in the function parse_post_info, which passes a dictionary on to the function that goes over all blog pages and opens every single post, and then saves the dictionary that the function parse_post_info returns IF it is not None, but I think it IS empty because something about the date format goes wrong.
Also - why does the code work once, and the same code throws a dateerror the second time:
DateError: unknown date format for '2015-06-09T07:01:55+00:00'
Here is the function:
from pattern.db import Database, field, pk, date, STRING, INTEGER, BOOLEAN, DATE, NOW, TEXT, TableError, PRIMARY, eq, all
from pattern.web import URL, Element, DOM, plaintext
def parse_post_info(p):
""" This function receives a post Element from the post list and
returns a dictionary with post url, post title, labels, date.
"""
try:
post_header = p("header.entry-header")[0]
title_tag = post_header("a < h1")[0]
post_title = plaintext(title_tag.content)
print post_title
post_url = title_tag("a")[0].href
date_tag = post_header("div.entry-meta")[0]
post_date = plaintext(date_tag("time")[0].datetime).split("T")[0]
#post_date = date(post_date_text)
print post_date
post_id = int(((p).id).split("-")[-1])
post_content = get_post_content(post_url)
labels = " "
print labels
return dict(blog_no=blog_no,
post_title=post_title,
post_url=post_url,
post_date=post_date,
post_id=post_id,
labels=labels,
post_content=post_content
)
except:
pass
The date() function returns a new Date, a convenient subclass of Python's datetime.datetime. It takes an integer (Unix timestamp), a string or NOW.
You can have diff with local time.
Also the format is "YYYY-MM-DD hh:mm:ss".
The convert time format can be found here
I'm trying to edit the group membership for a user, I have in my controller:
def change_membership():
if request.vars.id:
row = db(db.auth_membership.user_id == request.vars.id).select()
id = row[0].id
form = SQLFORM(db.auth_membership,
id,
fields=['group_id'],
_action=URL()
)
if form.process().accepted:
...redirect back to user list
if form.errors:
response.flash = 'form has errors'
return dict(form=form)
But It doesn't work, I get a :
list index out of range
I know that only get one row, but I don't understand why its seems empty..
Thanks in advance
Christian
Excellent!
Thanks a lot Anthony and Massimo.
It´s save my day, now all is working using request.get_vars.id instead of request.vars.id
Reference:
2012/8/22 Anthony wrote:
Yes. Note, web2py stores GET variables in request.get_vars and POST variables in request.post_vars. It stores both GET and POST vars in request.vars. If both get_vars and post_vars have variables with the same name, it puts their values in a list within request.vars. Just change your code to use request.get_vars.id instead of request.vars.id.
2012/8/22 Massimo Di Pierro wrote:
You have two id fields. One in request.get_vars.id (from the url) and one in request.post_vars.id (from the form submission).