Support for Symbol operators

[RichAyotte]

String operators have been deprecated in Sequelize since version 4 and they'll be completely dropped in version 5. Would you consider making the minimum Sequelize version to 4 and accept a patch for operator Symbols?

https://github.com/sequelize/sequelize/pull/9278

[mickhansen]

I'd hate to drop Sequelize v3 support as i have a major production system running on it. We could definitely look at operator symbols though.

[RichAyotte]

Would a version check from require('sequelize').Sequelize.version in https://github.com/mickhansen/graphql-sequelize/blob/d39d0ce48ea248831480161f1aeff68f240f7b5c/src/replaceWhereOperators.js#L38 be acceptable?

[RichAyotte]

Something like

 if (version >= 4) {
  return replaceKeyDeep(where, {
    and: Op.and,
    or: Op.or,
    gt: Op.gt,
    gte: Op.gte,
    lt: Op.lt,
    lte: Op.lte,
    ne: Op.ne,
    between: Op.between,
    notBetween: Op.notBetween,
    in: Op.in,
    notIn: Op.notIn,
    notLike: Op.notLike,
    iLike: Op.iLike,
    notILike: Op.notILike,
    like: Op.like,
    overlap: Op.overlap,
    contains: Op.contains,
    contained: Op.contained,
    any: Op.any,
    col: Op.col
  });
}

[mickhansen]

Regarding replaceWhereOperators i'd generally love to see it moved to a plugin instead, i don't like throwing away the type strictness of GraphQL so i'd ideally look to remove it from core, or atleast expose it as a typed object of sorts.

[RichAyotte]

Are you suggesting a new type like whereType that would replace JSONType?

[mickhansen]

Something like that, i'd like to make the entire where functionality pluggable, and then leave it to somebody else to device if they want types or not.

[mickhansen]

Happy to merge a PR adding operator support though, won't remove where untill there's a strategy in place and a major is done.