How can I get the COUNT of a certain field that suppose to return a list of connected entities?

Option 1: You could connect via any Dgraph client to slash as mentioned here and fire a count query. As mentioned, " The form count(uid) counts the number of UIDs matched in the enclosing block.". This will help you count the posts.

Option 2: Fire a custom DQL as mentioned here.

IMO, option 1 might be better here.

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