Add clear method to Query

[mtsewrs]

This is related to the issue #273 which adds a clear method to be able to reset the query to undefined again after fetching.

[chrisdrackett]

my only potential suggestion here is using clearData vs. clear just to make it more clear what you are clearing. clear?

[mtsewrs]

Ok I thought that was clear but we can rename it.

[chrisdrackett]

@mattiasewers just one comment, but also curious what use case you are hitting with this

[special-character]

@mattiasewers Thanks for the PR. Could you explain a bit about what this is helping you solve? I understand you are clearing the data for the Query but I don't quite understand why you need to do this.

When we use the Query it is typically from the RootStore.base file which creates a new query for every request. Are you re-using the query object somehow?

[mtsewrs]

@chrisdrackett @special-character I'm working on a app for my company where I need to reset the data object without making a another request, I don't know if that is possible currently which is why I made this pr.

[special-character]

@mattiasewers Thanks for commenting, I get that you need to clear the data I was curious about what the use case was and how you were using the Query. I haven't used the data directly from the Query object because it has been more internal for mst-gql (until now). The only case I was thinking of was for clearing the cache for the query the next time it is called with the same args. I always use the data out of the store or use the query options to change how a particular request acts.

Do you need it to clear the cache or is there another use case that you need this for?

[mtsewrs]

@special-character Yes I need to clear the cache but only for that Query object