How is some fields are automatically disabled when saving the record in odoo10?

Question

I have a module with some fields are readonly.I use onchange* function in  this module.The onchange is based on *partner_id.
*I selected *partner_id* and some fields are *automatically loaded* in my form.
*phone,email,mobile *fields are readonly* in my module.When i *save *the module these fields are automatically *disabled.
*I changed these fields *readonly =False *then it is working properly.The fields do *not disabled.*
Question
* What  are the phenomena behind this concept? *

Anil Kesariya · Answer

Hi   Aslam,

The word "*Read-only*" itself said this cannot be write simply. it is only Readable.
The values of read-only fields  will be display when if there is onchange() method written for thosefields, but values of those fields will not be saved because the field is only in Read mode (Read only).
If you want to write the data inside the Readonly field. you need to override the *write()* and *create()* method of *ORM*.
Hope this will clear your idea about read-only  fields.
Happy Odooing.
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