we need to che change the book. "owner" is a keyword in postgresql. When we wrote the 4th edition of the book, web2py was not checking by default. recent versions of web2py are checking.
On Monday, 25 February 2013 17:02:09 UTC-6, Toby Wilson wrote: > > Thanks Cliff and Niphlod... appreciate your assistance. > > I'll go through the book a little slower and get clear on this. > > In the book it shows an example using the word "owner". When I copy and > paste this in, I can't access the database administration option as I get > an internal error with the message in the ticket stating: > <type 'exceptions.SyntaxError'> invalid table/column name "owner" is a > "ALL" reserved SQL keyword > Anyway, so I just changed it to "owne" instead and it all works. > > Another thing, while going through the steps outlined in the book, I've > been using the shell in Controllers. I type a line, for example: > > db.thing.insert(name='Chair', owne=1) > > > and press enter and nothing happens. Then I'll type it again and hit enter > and it outputs: > > In [11] : db.thing.insert(name='Chair', owne=1) > 4 > > Showing that it worked. As I keep doing this and even change what I type > in, it only works every second time. One time I hit enter and nothing > happens, then after typing I hit enter and it seems to work. > > Am I doing something wrong or is this a bug in web2py or in my > installation perhaps? > > Toby > > On Monday, 25 February 2013 18:24:48 UTC+11, Toby Wilson wrote: >> >> >> Hi all, >> >> New to web development and web2py. Know a bit of Python. >> >> As a learning experience I’ve written a food tracking program that works >> really well in Python and it just runs on my local PC. It just reads and >> writes values into text files. >> >> Now I’m trying to transfer that into web2py as a next step learning >> experience. I’m trying to figure out the database side of it (models). >> >> It seems what I’m dealing with is many-to-many relationships. I have a >> list of meals and each meal has a list of associated ingredients. So one >> ingredient can be in many meal and each meal has many ingredients. >> >> So essentially, what the program I've written can do is add 3 x “Meal 1” >> to the quantity existing in the database for “Meal 1” and then after doing >> that prompt the user with: >> >> “Do you want this to impact the level of the ingredient ‘carrot’?” Y/N >> >> And then: >> >> “Do you want this to impact the level of the ingredient ‘steak’? Y/N >> >> etc. >> >> And the program knows that “Meal 1” needs 3 carrots, so upon entering “Y” >> to the first question, 3 carrots are automatically subtracted from the >> stock level of carrots in the database. >> >> So as meals are added, the user is prompted with associated ingredients >> and can choose to update or not update the level of that associated >> ingredient. >> >> In the local Python program I’ve written, all of this is just done >> through listing things in dictionaries and using functions to manipulate >> the data and then read and write to text files. Now I want to use database >> tables and I’m not sure how much of the association should be in the model >> and how much (if any) should be in the controller (for example in the form >> of a dictionary). >> >> I’ve read through the documentation on many to many relationships but >> haven’t got a full grasp of it yet. >> >> I’ve coded a few different database structures but haven’t managed to get >> it right yet. >> >> The way I've been thinking about it is, a table for meals, a table for >> ingredients, and perhaps a table for associations? I've used "reference" to >> get the drop down box associated, but I can't select more than ingredient. >> I had a look at the Django admin login and it visually made this look a bit >> easier - i.e. building the one to many relationship. How is this done in >> web2py? >> >> Any help or advice would be much appreciated. >> >> Toby >> >> P.S. If I have a database file in web2py and open the file through the >> web2py IDE and replace the contents with a totally different database >> structure and save it, what happens? Does web2py just remove what was there >> in the database and replace the database tables with the new ones or does >> it manage it in a different way (i.e. only add new elements etc.)? >> >> >> > -- --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
