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My buildForm() method queries the database and returns data which is used to calculate default values for the form. How can I use these values in submitForm() without querying the database again?

  • Why would you need another query in submit handler? – user21641 Jan 1 '16 at 16:48
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Typically, the $form_state object can be used to stash that data. $form_state->getStorage() references a simple array that you can put whatever you like inside, which you can then retrieve in submitForm() the same way.

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    Specifically, use $form_state->get()/$form_state->set() to set and access these values. – Berdir Jan 1 '16 at 8:11

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