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Rails where condition using NOT NIL

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Setting href attribute at runtime

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How to get the seconds since epoch from the time + date output of gmtime()?

How do you do reverse gmtime() , where you put the time + date and get the number of seconds? 6 Answers ...
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How do I convert a Ruby class name to a underscore-delimited symbol?

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Ruby Regexp group matching, assign variables on 1 line

I'm currently trying to rexp a string into multiple variables. Example string: 5 Answers ...
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Store query result in a variable using in PL/pgSQL

How to assign the result of a query to a variable in PL/pgSQL, the procedural language of PostgreSQL? 5 Answers ...
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Gradle, “sourceCompatibility” vs “targetCompatibility”?

...ty and targetCompatibility ? What happens when they are set to different values? 5 Answers ...
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What is an SDL renderer?

I'm starting with SDL2 and having some trouble trying to understand what an SDL_Renderer is. 2 Answers ...
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How do I do a 'git status' so it doesn't display untracked files without using .gitignore?

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Select distinct values from a table field

... head around the Django's ORM. What I want to do is get a list of distinct values within a field on my table .... the equivalent of one of the following: ...