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GraphViz - How to connect subgraphs?
...the cluster's built-in "label" attribute, which should be set to the empty string (in Python, label='""'). This means I'm no longer adding edges that connect clusters directly, but it works in my particular situation.
share...
Random record in ActiveRecord
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I haven't found an ideal way to do this without at least two queries.
The following uses a randomly generated number (up to the current record count) as an offset.
offset = rand(Model.count)
# Rails 4
rand_record = Model.offset(offset).first...
How do I display the current value of an Android Preference in the Preference summary?
...public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
Preference pref = findPreference(key);
if (pref instanceof ListPreference) {
ListPreference listPref = (ListPreference) pref;
pref.setSummary(listPref.getEntry());
}
}
This is easi...
Django queries - id vs pk
When writing django queries one can use both id/pk as query parameters.
2 Answers
2
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How can I convert spaces to tabs in Vim or Linux?
...k for all your text, not only spaces in the begin of the line. That mean a string like: "Hey,␣this␣␣␣␣is␣4␣spaces" will become "Hey,␣this⇥is␣4␣spaces", but its not! its a tab!.
To settle this little problem I recomend a search, instead of retab.
:%s/^\(^I*\)␣␣␣␣/\1^I/g
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How do I browse an old revision of a Subversion repository through the web view?
...and it does). I've been told many times it's not possible. Note that the string mentioned must be right after the repo root in the URL, then you can put subdirs of the repo after it.
– rmeador
Mar 16 '09 at 17:27
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When should I use a composite index?
...he tables in a query (Exemptions are there. eg, Merging of indexes). Which ideally means that a table in a query, must use a single index for all where-clause, table join, group-by and order-by. So a separate index on each column may not work always but a composite index can do the magic.
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Why main does not return 0 here?
... @Mr.32 : good observation, printf() returns the length of the string so it is 9 which is the "return" ofthe main (without using -std=c99).
– Hicham
Dec 30 '11 at 9:16
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any tool for java object to object mapping? [closed]
...re:
Commons-BeanUtils: ConvertUtils -> Utility methods for converting String scalar values to objects of the specified Class, String arrays to arrays of the specified Class.
Commons-Lang: ArrayUtils -> Operations on arrays, primitive arrays (like int[]) and primitive wrapper arrays (like In...
How can I default a parameter to Guid.Empty in C#?
...in ASP.NET MVC controller action? All other optional parameters work (int, string) but it doesn't work for GUID, says "Server Error in '/' Application. The parameters dictionary contains a null entry for parameter 'categoryId' of non-nullable type 'System.Guid' .." The code compiles fine with both s...