I have a flatlist in react-native and I am trying to refetch the data when pulling it down (the native refresh functionality). When I do, I am getting this error:
Typeerror: undefined is not an object
I can't figure out what is going wrong. I am using
- Expo SDK 38
- "@apollo/client": "^3.1.3",
- "graphql": "^15.3.0",
This is my code:
export default function DiscoverFeed({ navigation }) {
const theme = useTheme();
const { data, error, loading, refetch, fetchMore, networkStatus } = useQuery(
GET_RECIPE_FEED,
{
variables: { offset: 0 },
notifyOnNetworkStatusChange: true,
}
);
if (error) return <Text>There was an error, try and reload.</Text>;
if (loading) return <Loader />;
if (networkStatus === NetworkStatus.refetch) return <Loader />;
const renderItem = ({ item }) => {
return (
<View style={styles.cardItems}>
<RecipeCard item={item} navigation={navigation} />
</View>
);
};
return (
<SafeAreaView style={styles.safeContainer} edges={["right", "left"]}>
<FlatList
style={styles.flatContainer}
data={data.recipe}
removeClippedSubviews={true}
renderItem={renderItem}
refreshing={loading}
onRefresh={() => {
refetch();
}}
keyExtractor={(item) => item.id.toString()}
onEndReachedThreshold={0.5}
onEndReached={() => {
// The fetchMore method is used to load new data and add it
// to the original query we used to populate the list
fetchMore({
variables: {
offset: data.recipe.length,
},
});
}}
/>
</SafeAreaView>
);
}
I have a typepolicy like so:
export const cache = new InMemoryCache({
typePolicies: {
Query: {
fields: {
recipe: {
merge: (existing = [], incoming, { args }) => {
// On initial load or when adding a recipe, offset is 0 and only take the incoming data to avoid duplication
if (args.offset == 0) {
console.log("offset 0 incoming", incoming);
return [...incoming];
}
console.log("existing", existing);
console.log("incoming", incoming);
// This is only for pagination
return [...existing, ...incoming];
},
},
},
},
},
});
And this is the query fetching the data:
export const GET_RECIPE_FEED = gql`
query GetRecipeFeed($offset: Int) {
recipe(order_by: { updated_at: desc }, limit: 5, offset: $offset)
@connection(key: "recipe") {
id
title
description
images_json
updated_at
dishtype
difficulty
duration
recipe_tags {
tag {
tag
}
}
}
}
`;