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Flask-SQLAlchemy import/context issue
... id = db.Column(db.Integer, primary_key=True)
...
# Create the database tables.
db.create_all()
...
# start the flask loop
app.run()
I just splitted one app.py to app.py and model.py without using Blueprint. In that case, the above answer dosen't work. A line code is needed to work.
before:
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How can I merge properties of two JavaScript objects dynamically?
...ties versus just copying or defining new properties. This may make it unsuitable for merging new properties into a prototype if the merge sources contain getters." (developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…). I had to use var merged = {...obj1, ...obj2}.
– m...
PHP: Storing 'objects' inside the $_SESSION
... it on every request. Then the server uses that ID as a key into a big hashtable of Session objects. Whenever the server gets a request, it looks up the Session info out of its hashtable of session objects based on the ID the client submitted with the request. All this extra work is a double whammy ...
Can functions be passed as parameters?
... example of how to best use this idea! I have recreated it using an lookup table of structs that store info, including a pointer to the function you wish to execute. Perfect for this!
– James O'Toole
Oct 31 '16 at 5:16
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Is there a way to auto-adjust Excel column widths with pandas.ExcelWriter?
...e SQL Server data into a dataframe
my_sql_query = """ SELECT * FROM dbo.my_table """
my_dataframe = pd.read_sql_query(my_sql_query,con=read_engine)
#Set destination directory to save excel.
xlsFilepath = r'H:\my_project' + "\\" + 'my_file_name.xlsx'
writer = pd.ExcelWriter(xlsFilepath, engine='xlsx...
How to use LINQ to select object with minimum or maximum property value
...lower than the other solution suggested. However, if this is a LINQ to SQL table and DateOfBirth is an indexed column, then SQL Server will use the index instead of sorting all the rows. Other custom IEnumerable<T> implementations could also make use of indexes (see i4o: Indexed LINQ, or the o...
Bitwise operation and usage
...its input is 0, otherwise it's 0.
These can often be best shown as truth tables. Input possibilities are on the top and left, the resultant bit is one of the four (two in the case of NOT since it only has one input) values shown at the intersection of the inputs.
AND | 0 1 OR | 0 1 XOR |...
What are the differences between a HashMap and a Hashtable in Java?
What are the differences between a HashMap and a Hashtable in Java?
35 Answers
35
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How do I run a Ruby file in a Rails environment?
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If you make the script executable by running chmod +x script.rb, you can add #!/usr/bin/env rails runner to the top of the script, and then simply run it with ./script.rb.
– stwr667
Sep 16 at 6:30
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Android: How to stretch an image to the screen width while maintaining aspect ratio?
...ing how simply, in Android, you can do "totally dynamic cell heights" in a table view .. err, I mean ListView. Enjoy.
<com.parse.ParseImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/post_image"
android:src="@drawable/icon_192"
...