Class: Led::Model

Inherits:
Object
  • Object
show all
Defined in:
lib/model.rb

Constant Summary collapse

SETTER_REGEXP = 
/^([0-9a-zA-Z_]+)=$/.freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(hash = {}, saved_hash = {}) ⇒ Model

Returns a new instance of Model.



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# File 'lib/model.rb', line 102

def initialize(hash = {}, saved_hash = {})
  @values = hash
  @saved_values = @values
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(m, *args) ⇒ Object 



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# File 'lib/model.rb', line 140

def method_missing(m, *args)
  if m =~ SETTER_REGEXP
    @values[$1.to_sym] = args[0]
  else
    @values[m]
  end
end

Instance Attribute Details

#values ⇒ Object (readonly)

Returns the value of attribute values.



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# File 'lib/model.rb', line 100

def values
  @values
end

Class Method Details

.[](key) ⇒ Object 



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# File 'lib/model.rb', line 39

def [](key)
  from_json(Led.conn.hget(object_map_key, key))
end

.add_index(key) ⇒ Object 



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# File 'lib/model.rb', line 31

def add_index(key)
  indexes[key] = "models:#{name.downcase}:indexes:#{key}"
end

.create(hash) ⇒ Object 



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# File 'lib/model.rb', line 59

def create(hash)
  new(hash).save(true)
end

.filter(term) ⇒ Object 



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# File 'lib/model.rb', line 63

def filter(term)
  conditions = {}
  sets = []
  
  term.each do |k, v|
    if indexes[k]
      sets << index_set_key(k, v)
    else
      conditions[k] = v
    end
  end
  
  # load objects
  if sets.empty?
    objects = Led.conn.hgetall(object_map_key).map do |s|
      from_json(s)
    end
  else
    intersected = Led.conn.sinter(*sets)
    return [] if intersected.empty?

    objects = Led.conn.hmget(object_map_key, intersected).map do |s|
      from_json(s)
    end
  end
  
  if conditions.empty?
    # return all found objects
    objects
  else
    objects.select do |o|
      conditions.inject(true) {|m, kv| m && (o[kv[0]] == kv[1])}
    end
  end
end

.from_json(json_str) ⇒ Object 



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# File 'lib/model.rb', line 43

def from_json(json_str)
  load(JSON.parse(json_str).symbolize_keys)
end

.index_set_key(key, value) ⇒ Object 



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# File 'lib/model.rb', line 51

def index_set_key(key, value)
  "models:#{name.downcase}:indexes:#{key}:#{value.inspect}"
end

.indexes ⇒ Object 



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# File 'lib/model.rb', line 35

def indexes
  @indexes ||= {}
end

.load(hash) ⇒ Object 



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# File 'lib/model.rb', line 55

def load(hash)
  new(hash, hash.dup)
end

.object_map_key ⇒ Object 



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# File 'lib/model.rb', line 47

def object_map_key
  @object_map_key ||= "models:#{name.downcase}:objects"
end

.primary_key ⇒ Object 



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# File 'lib/model.rb', line 27

def primary_key
  @primary_key ||= :id
end

.set_primary_key(key) ⇒ Object 



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# File 'lib/model.rb', line 23

def set_primary_key(key)
  @primary_key = key
end

Instance Method Details

#==(obj) ⇒ Object 



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# File 'lib/model.rb', line 153

def ==(obj)
  (obj.class == self.class) && (obj.values == @values)
end

#inspect ⇒ Object 



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# File 'lib/model.rb', line 148

def inspect
  v = values.map {|k, v| "#{k}: #{v.inspect}"}.join(', ')
  "#<#{self.class.name}:#{@values[:pkey]} #{v}>"
end

#pkey ⇒ Object 



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# File 'lib/model.rb', line 107

def pkey
  self.class.primary_key
end

#save(create = false) ⇒ Object 



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# File 'lib/model.rb', line 111

def save(create = false)
  if @saved_values[pkey] && @saved_values[pkey] != @values[pkey]
    # pkey value has changed, so first remove the old record
    Led.conn.hdel(self.class.object_map_key, @saved_values[pkey])
  end
  
  pk = @values[pkey]
  
  # save object
  Led.conn.hset(self.class.object_map_key, pk, @values.to_json)
  
  # update indexes
  self.class.indexes.each do |key, _|
    if create || (@saved_values[key] != @values[key])
      k = self.class.index_set_key(key, @saved_values[:key])
      Led.conn.srem(k, pk)
      k = self.class.index_set_key(key, @values[key])
      Led.conn.sadd(k, pk)
    end
  end

  # update saved values
  @saved_values = @values.dup

  self
end