Ruby：将空数组添加到字典中

Question

I am trying to create an array within a dictionary as follows.

What I would like to have:

"Message": {
            [    
               "0": "This is a message"
            ]  
           }

What I have now:

"Message": {
               "0": ["This is a message"
               ]
           }

I am using the following code to initialize the Message dictionary, and the array within it.

  if not_found
    convoNum = 0
    arrayIndex = 0
    sessions["total"] = (sessions["total"].to_i + 1).to_s
    sessions["users"]["#{sessions["total"]}"] = {"arrayIndex"=>"#{arrayIndex}", "convoNum"=>"0"}
    sessions["users"]["#{sessions["total"]}"]["Message"] = {}
    sessions["users"]["#{sessions["total"]}"]["Message"][sessions["users"]["#{sessions["total"]}"]["Message"].length] = []
  end

I am having trouble in rendering my desired layout. Simply adding sessions["users"]["#{sessions["total"]}"]["Message"] = {[]} causes my database to crash upon initiation. Any help in getting to the first layout would be appreciated.

Answer 1

When you say this:

{
  [    
     "0": "This is a message"
  ]  
}

That is not valid Ruby. You're putting a key/value pair in an array, that doesn't make any sense.

Answer 2

You cannot have (Array cannot have key value pairs)

"Message": {
            [    
               "0": "This is a message"
            ]  
           }

You can have

"Message": {
               "0": "This is a message",
               "1": "Next message"
           }

You can initialize it like this

sessions["users"]["#{sessions["total"]}"]["Message"] = {}

And add values like

sessions["users"]["#{sessions["total"]}"]["Message"]["0"] = "This is a message"