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React-Native FlatList- Warning: Each child in an array or iterator should have a unique “key” prop, even after giving key={index}

General Tech Bugs & Fixes 2 years ago

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Posted on 16 Aug 2022, this text provides information on Bugs & Fixes related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.

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manpreet Tuteehub forum best answer Best Answer 2 years ago

 

I am building the photo-feed application, project-repo-here , in the comments section after clicking on show-comments, it shows comment page on a device, but in a terminal, it breaks with error as,

error is in comments.js file.

Warning: Each child in an array or iterator should have a unique "key" prop.%s%s See documentationOfREact/react-warning-keys for more information.%s, 

Check the render method of `VirtualizedList`., , 
    in CellRenderer (at VirtualizedList.js:687)
    in VirtualizedList (at FlatList.js:662)
    in FlatList (at comments.js:212)
    in RCTView (at View.js:44)
    in comments (created by SceneView)
    in SceneView (at StackViewLayout.js:795)
    in RCTView (at View.js:44)
    in AnimatedComponent (at StackViewCard.js:69)
    in RCTView (at View.js:44)
    in AnimatedComponent (at screens.native.js:59)
    in Screen (at StackViewCard.js:57)
    in Card (at createPointerEventsContainer.js:27)
    in Container (at StackViewLayout.js:860)
    in RCTView (at View.js:44)
    in ScreenContainer (at StackViewLayout.js:311)
    in RCTView (at View.js:44)
    in AnimatedComponent (at StackViewLayout.js:307)
    in Handler (at StackViewLayout.js:300)
    in StackViewLayout (at withOrientation.js:30)
    in withOrientation (at StackView.js:79)
    in RCTView (at View.js:44)
                                                
                                                


                                                    

                                                        
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manpreet 2 years ago

 

You need to return the Key like this

keyExtractor={(item, index) => {
          return item.id;
        }}
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