before add-access-rule

[Manchuker]

How to determine whether the added policy exists in the existing rulebases and does not conflict before adding an access rule.

use "show-access-rulebase"  

I want use "show-access-rulebase"  and filter to obtain the source, destination, and service, is that not possible?

"show-access-rulebase","filter": "source:{uid} AND source:{uid} AND destination:{uid} service:{uid}"

Can I find a unique match?

[_Val_]

You can search the existing rulebase by IP address and/or object name

[PhoneBoy]

You'd have to programmatically parse the rulebase to see if an existing rule exists at current.
I believe it is something we are looking at for a future release.

[Manchuker]

I plan to use the source, destination, and service in the rulebase to make a complete match, which is considered a duplicate strategy, but there are also other situations.