#Hello again, a simple question, how to

1 messages · Page 1 of 1 (latest)

hexed stone
#

@lean tapir you can define a rule that verifies the length of the array. Here's an example of how you can achieve this by creating a rule in your schema:

entity entity_name {
  attribute attribute_name string
  
  // Example permission using the rule
  permission example_permission = is_not_empty(attribute_name)
}

rule is_not_empty(attribute_name string) {
    len(attribute_name) > 0
}
lean tapir
#

Thanks len function. Is this documented somewhere, just wondering if I am missing any reference

hexed stone
#

Hi, I came up with the len function but had a conversation with the team and they corrected me. We have .size function instead.

#

Also they propose additional approach:

# 
entity entity_name {
  attribute attribute_name string[]
  
  // Example permission using the rule
  permission example_permission = is_not_empty(attribute_name)
}

rule is_not_empty(attribute_name string[]) {
    attribute_name.size() > 0
}
#

Could you try this one.