Array of Hashes to JSON File Ruby - arrays

Question

I'm trying to create JSON files dynamically, where the content of each file belongs only to a certain entity.
I have an array of Ruby objects, where each object represents an entity.
entities = [#<Entity:0x0055f364d9cd78 #name="entity-B", #internal_asn_number=64514, #classification_id="B">,#<Entity:0x0055f364d89070 #name="entity-A", #internal_asn_number=64513, #classification_id="A">]
And I have an array of hashes, which contains several rules for each entity and I would like to write these hashes to JSON files, one file per entity.
I have the following code:
array_hashes = [{"rulename"=>"entity-B_source_fqdn_1", "if"=>{"source.fqdn"=>"mail.tec.dsr.entityB.com"}, "then"=>{"event_description.text"=>"B"}}, {"rulename"=>"entity-B_destination_fqdn_1", "if"=>{"destination.fqdn"=>"mail.tec.dsr.entity_B.com"}, "then"=>{"event_description.text"=>"B"}}, {"rulename"=>"entity-A_source_fqdn_1", "if"=>{"source.fqdn"=>"194-65-57-128.entityA.com"}, "then"=>{"event_description.text"=>"A"}}, {"rulename"=>"entity-A_destination_fqdn_1", "if"=>{"destination.fqdn"=>"194-65-57-128.entityA.com"}, "then"=>{"event_description.text"=>"A"}}]
path = "/home/mf370/Desktop/RubyProject/"
file_name = "_url_fqdn.conf"
entities.each do |entity|
File.open(path + entity.name + file_name, "w") do |f|
array_hashes.each do |rule|
if rule['rulename'].match(entity.name)
f.write(JSON.pretty_generate([rule]))
end
end
end
This code works and creates the files dynamically, however the content of the files is not what I was expecting.
This is the output from the code above:
[
{
"rulename": "entity-A_source_fqdn_1",
"if": {
"source.fqdn": "194-65-57-128.entityA.com"
},
"then": {
"event_description.text": "A"
}
}
][
{
"rulename": "entity-A_destination_fqdn_1",
"if": {
"destination.fqdn": "194-65-57-128.entityA.com"
},
"then": {
"event_description.text": "A"
}
}
]
And this is the output that I was looking for:
[
{
"rulename": "entity-A_source_fqdn_1",
"if": {
"source.fqdn": "194-65-57-128.entityA.com"
},
"then": {
"event_description.text": "A"
}
},
{
"rulename": "entity-A_destination_fqdn_1",
"if": {
"destination.fqdn": "194-65-57-128.entityA.com"
},
"then": {
"event_description.text": "A"
}
}
]
Probably this is very simple to solve, but I ran out of ideas on how to solve this, I'm new to Ruby Programming. Thank you for your help!

Answer 1

The problem is that you pack each rule inside an array :
JSON.pretty_generate([rule])
You should create an array of matching rules, and dump it as JSON :
entities.each do |entity|
File.open(File.join(path, entity.name + file_name), "w") do |f|
matching_rules = array_hashes.select{ |rule| rule['rulename'].match(entity.name) }
f.write(JSON.pretty_generate(matching_rules))
end
end

Answer 2

The Problem is that you wrap each rule in an array.
THis should solve the issue:
json_entities = []
entities.each do |entity|
File.open(path + entity.name + file_name, "w") do |f|
array_hashes.each do |rule|
if rule['rulename'].match(entity.name)
json_entities << rule
end
end
end
end
f.write(JSON.pretty_generate(json_entities))