Accommodate @client @export variable changes in ObservableQuery
#4604
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benjamn
requested changes
Mar 20, 2019
When using `client.watchQuery` to setup an Observable against a query that's using `@client @export` directives, cache changes could happen that lead to the value of the `@client @export` variable changing. When this happens, if the watched query is using a mixture of local and remote data, the watched query itself might become invalid, since the `@client @export` variable used to fetch the data has now changed. To address this, this commit updates the `ObservableQuery` observers such that they first check to see if `@client @export` directives are being used, and update any associated variables. It will then perform a `refetch` using the new variables if needed, otherwise it will let the observers continue with their normal behaviour.
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benjamn
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Apr 5, 2019
benjamn
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Apr 5, 2019
| // changed, and the query is calling against both local and remote | ||
| // data, a refetch is needed to pull in new data, using the | ||
| // updated `@export` variables. | ||
| if (queryManager.transform(query).hasClientExports) { |
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By using cached data from queryManager.transform(query) we can avoid repeatedly calling hasClientExports or queryManager.getLocalState().serverQuery (below).
benjamn
reviewed
Apr 5, 2019
| @@ -713,7 +713,7 @@ export class QueryManager<TStore> { | |||
| }> | |||
| >(); | |||
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| private transform(document: DocumentNode) { | |||
| public transform(document: DocumentNode) { | |||
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I don't love making this public, but at least the result type is read-only.
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hwillson
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Feb 14, 2020
PR #4604 fixed an issue where changes made to `@client @export` based variables didn't always result in re-running the query that was using the variable. Unfortunately, these changes are a bit too aggressive. They're triggering a `refetch` when an `@client @export` based variable changes (and a few additional conditions are met), and while using the `ObservableQuery.refetch()` method does fix the original issue, it leads to a situation where the query being re-run is always fired over the network, even if the updated query could have been resolved from the cache. `ObservableQuery.refetch()` forces queries to use a network based fetch policy, which means if the query was originally fired with a `cache-first` policy (for example), and has matching data in the cache after taking into consideration the new variable, that data won't be used and instead an extra unnecessary network request will fire. This commit addresses the issue by leveraging `ObservableQuery.setVariables()` instead of automatically refetching. `setVariables` will attempt to resolve the updated query from the cache first, then only fire it over the network if required.
hwillson
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Feb 14, 2020
PR #4604 fixed an issue where changes made to `@client @export` based variables didn't always result in re-running the query that was using the variable. Unfortunately, these changes are a bit too aggressive. They're triggering a `refetch` when an `@client @export` based variable changes (and a few additional conditions are met), and while using the `ObservableQuery.refetch()` method does fix the original issue, it leads to a situation where the query being re-run is always fired over the network, even if the updated query could have been resolved from the cache. `ObservableQuery.refetch()` forces queries to use a network based fetch policy, which means if the query was originally fired with a `cache-first` policy (for example), and has matching data in the cache after taking into consideration the new variable, that data won't be used and instead an extra unnecessary network request will fire. This commit addresses the issue by leveraging `ObservableQuery.setVariables()` instead of automatically refetching. `setVariables` will attempt to resolve the updated query from the cache first, then only fire it over the network if required.
hwillson
added a commit
that referenced
this pull request
Feb 14, 2020
PR #4604 fixed an issue where changes made to `@client @export` based variables didn't always result in re-running the query that was using the variable. Unfortunately, these changes are a bit too aggressive. They're triggering a `refetch` when an `@client @export` based variable changes (and a few additional conditions are met), and while using the `ObservableQuery.refetch()` method does fix the original issue, it leads to a situation where the query being re-run is always fired over the network, even if the updated query could have been resolved from the cache. `ObservableQuery.refetch()` forces queries to use a network based fetch policy, which means if the query was originally fired with a `cache-first` policy (for example), and has matching data in the cache after taking into consideration the new variable, that data won't be used and instead an extra unnecessary network request will fire. This commit addresses the issue by leveraging `ObservableQuery.setVariables()` instead of automatically refetching. `setVariables` will attempt to resolve the updated query from the cache first, then only fire it over the network if required.
hwillson
added a commit
that referenced
this pull request
Feb 14, 2020
PR #4604 fixed an issue where changes made to `@client @export` based variables didn't always result in re-running the query that was using the variable. Unfortunately, these changes are a bit too aggressive. They're triggering a `refetch` when an `@client @export` based variable changes (and a few additional conditions are met), and while using the `ObservableQuery.refetch()` method does fix the original issue, it leads to a situation where the query being re-run is always fired over the network, even if the updated query could have been resolved from the cache. `ObservableQuery.refetch()` forces queries to use a network based fetch policy, which means if the query was originally fired with a `cache-first` policy (for example), and has matching data in the cache after taking into consideration the new variable, that data won't be used and instead an extra unnecessary network request will fire. This commit addresses the issue by leveraging `ObservableQuery.setVariables()` instead of automatically refetching. `setVariables` will attempt to resolve the updated query from the cache first, then only fire it over the network if required.
hwillson
added a commit
that referenced
this pull request
Feb 15, 2020
PR #4604 fixed an issue where changes made to `@client @export` based variables didn't always result in re-running the query that was using the variable. Unfortunately, these changes are a bit too aggressive. They're triggering a `refetch` when an `@client @export` based variable changes (and a few additional conditions are met), and while using the `ObservableQuery.refetch()` method does fix the original issue, it leads to a situation where the query being re-run is always fired over the network, even if the updated query could have been resolved from the cache. `ObservableQuery.refetch()` forces queries to use a network based fetch policy, which means if the query was originally fired with a `cache-first` policy (for example), and has matching data in the cache after taking into consideration the new variable, that data won't be used and instead an extra unnecessary network request will fire. This commit addresses the issue by leveraging `ObservableQuery.setVariables()` instead of automatically refetching. `setVariables` will attempt to resolve the updated query from the cache first, then only fire it over the network if required.
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When using
client.watchQueryto setup anObservableagainst a query that's using@client @exportdirectives, cache changes could happen that lead to the value of the@client @exportvariable changing. When this happens, if the watched query is using a mixture of local and remote data, the watched query itself might become invalid, since the@client @exportvariable used to fetch the original data has now changed.To address this, this PR updates the
ObservableQueryobservers such that they first check to see if@client @exportdirectives are being used, and update any associated variables.ObservableQuerywill then perform arefetchusing the new variables if needed, otherwise it will let the observers continue with their normal behaviour.It's important to note that these changes introduce Promises into
ObservableQuerysubscription handling, which can impact the timing ofObservableQuerysubscriber object calls and/or callbacks. I haven't yet determined how much of an impact this could have in practice, but these changes did impact one existing test suite. I've modified the tests to accommodate these changes (as I believe that test did not represent a real usage scenario), but I think we'll need to consider the impact of these changes carefully before merging.Fixes #4530.