class User
  include Mongoid::Document

  # Key has the type of String, value can be any data type (String, Date, Bool, etc)
  # Example: {"y" => "this is a string"}
  # Another example: {"x" => 1, "y" => "this is a string", "z" => Time.parse("2023-05-01")}
  field :a, type: Hash
end

# Add a document where the hash value of "y" is a String
user1 = User.create({ :a => { :y => "2023-05-01" } })

# Verify that the property is indeed a string
user1[:a][:y].class # => String
User.collection.find({}).first[:a][:y].class #  => String

# Selector is a filter on the "y" key inside the Hash "a" using a Time param
selector = {"a.y" => {"$gt" => Time.parse("2023-04-02 06:59:59 UTC")}}

# Mongo driver returns zero results using this selector
User.collection.find(selector).count # => 0

# Using mongoid to run a query
User.where(selector).count # => 0

# But the _matches? method in mongoid returns as matching
# I believe the value here should be false since there was no match in the db
user1._matches?(selector) # => true 

# Move the selector time into the future, still using Time as a param
selector = {"a.y" => {"$gt" => Time.parse("2023-12-12 06:59:59 UTC")}}

# Query still returns 0 as expected
User.where(selector).count # => 0

# Mongoid now returns false, leading me to believe user1[:a][:y] is being coerced into Time
user1._matches?(selector) # => false 

# Let's try again where user's "a.y" cannot be coerced to Time
user2 = User.create({:a => { :y => "foo bar" }})


# Mongo driver still returns 0 as expected
User.where(selector).count # => 0

# Mongoid as expected returns false
user2._matches?(selector) # => false