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how to add records to has_many :through association in rails
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'The best way' depends on your needs and what feels most comfortable. Confusion comes from differences ActiveRecord's behavior of the new and create methods and the << operator.
The new Method
new will not add an association record for you. You have to build the House and Agent ...
Removing index column in pandas when reading a csv
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Using df.to_sql("table",cursor,if_exists="append",index=False) also fixes the sqlite error sqlite3.OperationalError: table message has no column named index
– Anna
Jun 3 '18 at 0:55
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Fast stable sorting algorithm implementation in javascript
...and a given order (asc/desc). The order of results must be consistent and stable.
16 Answers
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Increment a database field by 1
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Updating an entry:
A simple increment should do the trick.
UPDATE mytable
SET logins = logins + 1
WHERE id = 12
Insert new row, or Update if already present:
If you would like to update a previously existing row, or insert it if it doesn't already exist, you can use the REPLACE synta...
Change the Right Margin of a View Programmatically?
... As per your NOTE: I have doubt. If the textview or a button is inside a table row? Then what should I use instead of Relative Layout, Table Layout?
– tejas
Jun 27 '13 at 4:19
1
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How to concatenate strings of a string field in a PostgreSQL 'group by' query?
...e the strings of a field within a group by query. So for example, I have a table:
14 Answers
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Why is setTimeout(fn, 0) sometimes useful?
...ustrating these examples: http://jsfiddle.net/C2YBE/31/ :
HTML code:
<table border=1>
<tr><td><button id='do'>Do long calc - bad status!</button></td>
<td><div id='status'>Not Calculating yet.</div></td>
</tr>
&l...
How to detect Windows 64-bit platform with .NET?
... /// The function determins whether a method exists in the export
/// table of a certain module.
/// </summary>
/// <param name="moduleName">The name of the module</param>
/// <param name="methodName">The name of the method</param>
/// <returns&g...
What is a 'thunk'?
...ayed
computation (similar to a closure)
a feature of some virtual function
table implementations (similar to a
wrapper function)
a mapping of machine data from one
system-specific form to another,
usually for compatibility reasons
I have usually seen it used in the third context.
http://en.wikipe...
Android splash screen image sizes to fit all devices
... ). My application is supposed to run good and beautiful on all phones and tablets. What sizes (in pixels) should I create so the splash displays nice on all screens?
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