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e24d8035b1
I don't know where the bug originates. But it can only be that either `previousResult` or `fetchMore` result is sometimes undefined. This should make the function bullet-proof for these situations.
18 lines
628 B
JavaScript
18 lines
628 B
JavaScript
import unionBy from 'lodash/unionBy'
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export default function UpdateQuery(component, { $state, pageKey }) {
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if (!pageKey) throw new Error('No key given for the graphql query { data } object')
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return (previousResult, { fetchMoreResult }) => {
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const oldData = (previousResult && previousResult[pageKey]) || []
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const newData = (fetchMoreResult && fetchMoreResult[pageKey]) || []
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if (newData.length < component.pageSize) {
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component.hasMore = false
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$state.complete()
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}
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const result = {}
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result[pageKey] = unionBy(oldData, newData, item => item.id)
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$state.loaded()
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return result
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}
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}
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