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How does Rails keep track of which migrations have run for a database?
... schema_migrations.
For example, running a migration file named 20120620193144_create_users.rb will insert a new row with a version of 20120620193144 into the schema_migrations table.
You are free at any point to introduce migrations with earlier versions. Rails will always run any new migrations ...
How to use ArrayAdapter
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edited Oct 20 '16 at 2:31
ivandov
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answered Feb 15 '10 at 11:57
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Why do some C# lambda expressions compile to static methods?
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153
This is most likely because there are no closures, for example:
int age = 25;
Action<string&...
ViewParam vs @ManagedProperty(value = “#{param.id}”)
...erConverter"). Invoking page by http://example.com/context/user.xhtml?id=123 will pass the id parameter through the converter and set the User object as a bean property.
@ManagedProperty:
Sets the value immediately after bean's construction.
Set value is available during @PostConstruct which allo...
Resolving conflicts: how to accept “their” changes automatically?
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answered Mar 21 '13 at 11:10
NofflsNoffls
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How to alter a column and change the default value?
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answered Jul 3 '12 at 13:54
fancyPantsfancyPants
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Why is lazy evaluation useful?
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Vinko Vrsalovic
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answered Nov 5 '08 at 15:07
mipadimipadi
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WCF service startup error “This collection already contains an address with scheme http”
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ericvgericvg
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Getting binary content in Node.js using request
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303
+100
OK, af...
How can I use “:” as an AWK field separator?
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399
"-F" is a command line argument, not AWK syntax. Try:
echo "1: " | awk -F ":" '/1/ {print $1...