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Rails migration: t.references with alternative name?

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getting exception “IllegalStateException: Can not perform this action after onSaveInstanceState”

...) : NEVER commit() transactions after onPause() on pre-Honeycomb, and onStop() on post-Honeycomb Be careful when committing transactions inside Activity lifecycle methods. Use onCreate(), onResumeFragments() and onPostResume() Avoid performing transactions inside asynchronous callback methods Use ...
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Using the Swift if let with logical AND operator &&

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What is the JavaScript version of sleep()?

...n only be executed in functions prefixed with the async keyword, or at the top level of your script in some environments (e.g. the Chrome DevTools console, or Runkit). await only pauses the current async function Two new JavaScript features helped write this "sleep" function: Promises, a native ...
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How to compare dates in Java? [duplicate]

...strings. LocalDate start = LocalDate.parse( "22-02-2010" , f ); LocalDate stop = LocalDate.parse( "25-12-2010" , f ); In date-time work, usually best to define a span of time by the Half-Open approach where the beginning is inclusive while the ending is exclusive. So we want to know if today is the...
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Add column with number of days between dates in DataFrame pandas

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iTextSharp - Sending in-memory pdf in an email attachment

... I tried the code posted by brianng and it worked. Just change the top of the code to this: var doc = new Document(); MemoryStream memoryStream = new MemoryStream(); PdfWriter writer = PdfWriter.GetInstance(doc, memoryStream); //capture the object doc.Open(); doc.Add(new Paragraph("First Pa...
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What is the difference (if any) between Html.Partial(view, model) and Html.RenderPartial(view,model)

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Error - trustAnchors parameter must be non-empty

...it in the manner described on the last row of the workaround script at the top of the post. share | improve this answer | follow | ...
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Difference between namespace in C# and package in Java

...s its own set of names for types, which helps to prevent name conflicts. A top level type is accessible (§6.6) outside the package that declares it only if the type is declared public. EDIT: Okay, after the clarification: a Java package is similar to a C# namespace - except that it has an impact ...