add support for slice to the Expr

[rande]

This code allows to get an slice of parameters in an expression

[lann]

Could you show an example of where this would be helpful?

[rande]

@lann here the usage : https://github.com/rande/gonode/blob/master/extra/goji.go#L129

This feature help me to expand the parameters from the Form struct into valid parameters.

Another solution will be to open the args attributes in the Expr structure

[lann]

Go itself generally doesn't hide the complexity of e.g. copying a []string to an []interface{} , and I'm inclined to take the same approach here, especially since you can't generalize it for all slice types (beyond the string/int you have here) without reflection.

Given that you only need to use []string's here, would it make sense to just have an e.g. stringsToIfaces helper func?

[lann]

Unfortunately I will not be able to review or merge major changes for the forseeable future; see README.

[technosophos]

Lann has moved Squirrel to the Masterminds project, and is still the architect, but @mattfarina and I will be helping him maintain. We'll start reviewing pull requests and see if we can get this in.

[c2h5oh]

Another use case - PostgreSQL array intersection:
squirrel.Expr("tags && ?", tagSlice)