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Expo :Addresses in a Contact object are undefined but visibles with JSON.stringify


Getting Yahoo contact names and email addresses using YQLReact Native ScrollView/FlatList not scrollingUsing Animated.Flatlist and Animated.ScrollView to animate an Animated.View is not smoothReact Native app does not start in Expo appCannot get current position without GPS on react-native with navigator.geolocationExpo app chrashes when executing from deployed instead from developmentUnable to resolve module (Expo, React Native)React Native Using Expo not showing Icon correctly [ (X) and ? ]Expo contacts native modalUnderstanding React Natives setState and componentWillMount from FlatList






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0















I tried all syntax I know, but I am unable to fetch the Addresses array I obtain by querying. I have no problem with phoneNumbers, but I do not understand what happens to addresses.



In fact, I have no problem with getContactsAsync to retrieve those datas. But when I obtain contact with getContactByIdAsync, I can see the datas are here, but I can not iterate them. I can see the addresses are here applying JSON.stringify on the datas concerned. But every other method replies 'undefined is not an object', or other errors. I tried with and without ContactQuery, and in all case, I can see datas are here. And I pass exactly the same objects in the same simple renderItem method.



I also tried a trick : set pagesize to 0 and pageoffset to the id of contact with the getContactsAsync method, but it does not work at all. And I realized that it concerns every arrays of a Contact...



So have you any idea of why I can read the arrays in one case, and in the second, all seems unreachable?



How can I resolve that?



In all the case, the datas have the same structure, they are exactly the same...



Thank you a lot if you have the answer.



EDIT



So, after again a lot of tests, I finally managed to resolve my problem.



As I am new to expo and react, and react native too, I follow the examples I see on the web.



In fact, the problem was in two part :



  1. It is not possible to trust in state mechanism. And often, using a Flatlist deals with this functionnality. So, I tested the two : props and state, and take the one which is not null before init FlatList.

  2. I deleted the common style attribute: flex : 1 on the FlatList.

And now, it works fine...










share|improve this question






























    0















    I tried all syntax I know, but I am unable to fetch the Addresses array I obtain by querying. I have no problem with phoneNumbers, but I do not understand what happens to addresses.



    In fact, I have no problem with getContactsAsync to retrieve those datas. But when I obtain contact with getContactByIdAsync, I can see the datas are here, but I can not iterate them. I can see the addresses are here applying JSON.stringify on the datas concerned. But every other method replies 'undefined is not an object', or other errors. I tried with and without ContactQuery, and in all case, I can see datas are here. And I pass exactly the same objects in the same simple renderItem method.



    I also tried a trick : set pagesize to 0 and pageoffset to the id of contact with the getContactsAsync method, but it does not work at all. And I realized that it concerns every arrays of a Contact...



    So have you any idea of why I can read the arrays in one case, and in the second, all seems unreachable?



    How can I resolve that?



    In all the case, the datas have the same structure, they are exactly the same...



    Thank you a lot if you have the answer.



    EDIT



    So, after again a lot of tests, I finally managed to resolve my problem.



    As I am new to expo and react, and react native too, I follow the examples I see on the web.



    In fact, the problem was in two part :



    1. It is not possible to trust in state mechanism. And often, using a Flatlist deals with this functionnality. So, I tested the two : props and state, and take the one which is not null before init FlatList.

    2. I deleted the common style attribute: flex : 1 on the FlatList.

    And now, it works fine...










    share|improve this question


























      0












      0








      0








      I tried all syntax I know, but I am unable to fetch the Addresses array I obtain by querying. I have no problem with phoneNumbers, but I do not understand what happens to addresses.



      In fact, I have no problem with getContactsAsync to retrieve those datas. But when I obtain contact with getContactByIdAsync, I can see the datas are here, but I can not iterate them. I can see the addresses are here applying JSON.stringify on the datas concerned. But every other method replies 'undefined is not an object', or other errors. I tried with and without ContactQuery, and in all case, I can see datas are here. And I pass exactly the same objects in the same simple renderItem method.



      I also tried a trick : set pagesize to 0 and pageoffset to the id of contact with the getContactsAsync method, but it does not work at all. And I realized that it concerns every arrays of a Contact...



      So have you any idea of why I can read the arrays in one case, and in the second, all seems unreachable?



      How can I resolve that?



      In all the case, the datas have the same structure, they are exactly the same...



      Thank you a lot if you have the answer.



      EDIT



      So, after again a lot of tests, I finally managed to resolve my problem.



      As I am new to expo and react, and react native too, I follow the examples I see on the web.



      In fact, the problem was in two part :



      1. It is not possible to trust in state mechanism. And often, using a Flatlist deals with this functionnality. So, I tested the two : props and state, and take the one which is not null before init FlatList.

      2. I deleted the common style attribute: flex : 1 on the FlatList.

      And now, it works fine...










      share|improve this question
















      I tried all syntax I know, but I am unable to fetch the Addresses array I obtain by querying. I have no problem with phoneNumbers, but I do not understand what happens to addresses.



      In fact, I have no problem with getContactsAsync to retrieve those datas. But when I obtain contact with getContactByIdAsync, I can see the datas are here, but I can not iterate them. I can see the addresses are here applying JSON.stringify on the datas concerned. But every other method replies 'undefined is not an object', or other errors. I tried with and without ContactQuery, and in all case, I can see datas are here. And I pass exactly the same objects in the same simple renderItem method.



      I also tried a trick : set pagesize to 0 and pageoffset to the id of contact with the getContactsAsync method, but it does not work at all. And I realized that it concerns every arrays of a Contact...



      So have you any idea of why I can read the arrays in one case, and in the second, all seems unreachable?



      How can I resolve that?



      In all the case, the datas have the same structure, they are exactly the same...



      Thank you a lot if you have the answer.



      EDIT



      So, after again a lot of tests, I finally managed to resolve my problem.



      As I am new to expo and react, and react native too, I follow the examples I see on the web.



      In fact, the problem was in two part :



      1. It is not possible to trust in state mechanism. And often, using a Flatlist deals with this functionnality. So, I tested the two : props and state, and take the one which is not null before init FlatList.

      2. I deleted the common style attribute: flex : 1 on the FlatList.

      And now, it works fine...







      contacts expo






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Mar 23 at 16:35







      Lux Aeterna

















      asked Mar 23 at 10:51









      Lux AeternaLux Aeterna

      126




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