getCacheKey does not handle where clauses with Symbols

[tomlagier]

Per Sequelize v4 docs, the correct way to include where clause operators is to import them from sequelize.Op, like so:

const { Op: {iLike} } = require('sequelize');
...
where: {
   name: { [iLike]: `%${args.query}%` },
},

These are implemented as Symbols within sequelize. Unfortunately, Object.keys does not return symbols when iterating over an object's properties to construct a cache key through stringifyObject.

The fix here is to merge Object.keys with Object.getOwnPropertySymbols in stringifyObject. I'll make a PR for it but anyone running into this can work around it by reverting to the sequelize v3 string-style $operator ($iLike) instead of using the imported operator.

Thanks for maintaining this library @mickhansen! Enjoying it and graphql-sequelize as my first entry into graphql very much.

[stale]

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