Added "is null" and "is not null" comparators for Datetimes. #67
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- they work a little bit different from other comparisons, since "HTML parameters don't usually work with a language-specific construct of nil". The passed in value for the filter is ignored and the comparison to nil/NULL is made instead. - for example, if you are filtering by parameters, you could 'add my_column_is_null' to the query string without a value - any value specified will be ignored. This addresses rcdilorenzo#62. It only adds the null comparators for DateTimes, however, it is straightforward to add them to other data types.
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They work a little bit different from other comparisons, since "HTML parameters don't usually work with a language-specific construct of nil". The passed in value for the filter is ignored and the comparison to nil/NULL is made instead.
For example, if you are filtering by parameters, you could 'add my_column_is_null' to the query string without a value - any value specified will be ignored.
This addresses #62. It only adds the null comparators for DateTimes, however, it is straightforward to add them to other data types.