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By allowing users to rewrite data lookups from the store, they can satisfy behavior like #332
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| import every = require('lodash.every'); | ||
| import has = require('lodash.has'); | ||
|
|
||
| import { | ||
| Field, | ||
| Variable, | ||
| } from 'graphql'; | ||
|
|
||
| import { | ||
| NormalizedCache, | ||
| StoreValue, | ||
| IdValue, | ||
| } from './store'; | ||
|
|
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| // Middleware that is given an opportunity to rewrite results from the store. | ||
| // It should call `next()` to look up the default value. | ||
| export type StoreFetchMiddleware = ( | ||
| field: Field, | ||
| variables: {}, | ||
| store: NormalizedCache, | ||
| next: () => StoreValue | ||
| ) => StoreValue; | ||
|
|
||
| // StoreFetchMiddleware that special cases all parameterized queries containing | ||
| // either `id` or `ids` to retrieve nodes by those ids directly from the store. | ||
| // | ||
| // This allows the client to avoid an extra round trip when it is fetching a | ||
| // node by id that was previously fetched by a different query. | ||
| // | ||
| // NOTE: This middleware assumes that you are mapping data ids to the id of | ||
| // your nodes. E.g. `dataIdFromObject: value => value.id`. | ||
| export function cachedFetchById( | ||
| field: Field, | ||
| variables: {}, | ||
| store: NormalizedCache, | ||
| next: () => StoreValue | ||
| ): StoreValue { | ||
| // Note that we are careful to _not_ return an id if it doesn't exist in the | ||
| // store! apollo-client assumes that if an id exists in the store, the node | ||
| // referenced must also exist. | ||
| if (field.arguments && field.arguments.length === 1) { | ||
| const onlyArg = field.arguments[0]; | ||
| // Only supports variables, for now. | ||
| if (onlyArg.value.kind === 'Variable') { | ||
| const variable = <Variable>onlyArg.value; | ||
| if (onlyArg.name.value === 'id') { | ||
| const id = variables[variable.name.value]; | ||
| if (has(store, id)) { | ||
| return toIdValue(id); | ||
| } | ||
| } else if (onlyArg.name.value === 'ids') { | ||
| const ids = variables[variable.name.value]; | ||
| if (every(ids, id => has(store, id))) { | ||
| return ids; | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // Otherwise, fall back to the regular behavior. | ||
| return next(); | ||
| } | ||
|
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||
| function toIdValue(id): IdValue { | ||
| return { | ||
| type: 'id', | ||
| id, | ||
| generated: false, | ||
| }; | ||
| } |
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