Re: [Interest] QVariant compare operator

[Jason H]

Probably the best way to handle this is for the model to maintain a map of column affinity, specified as QMetaType::Type, to compare items. The items themselves should also have an individual type. A database application will only need column affinity, a spreadsheet app will need item affinity. Then the model (as part of the model classes ( filter, sort)) should implement the automatic comparisons.

 

Python's repr() function is ideal for this. Not sure how Qt could support this, but I really enjoy repr()

 

 

 

Sent: Saturday, April 18, 2020 at 5:43 AM
From: "evilruff" <evilr...@gmail.com>
To: interest@qt-project.org
Subject: Re: [Interest] QVariant compare operator

Hi Thiago,

 

I am happy ro redesign my code, but how then sorting/filtering models will work? As data() returns QVariant. Or you plan to use setSorting based on lambda's and std::function to provide strict types sorting?

 

And what if from API point of view user want just to specify column without aware of data types.

 

Am I missing something? Woukd really appreceate if you can point me to some direction to look at. 

 

 

Regards, 

Yuri

 

 

Relational comparisons with QVariant are deprecated in 5.15 and will be
removed because they are a misfeaure. Redesign your code so your question does
not need to be asked.





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