Class: CassandraORM::Model

Inherits:
Base
  • Object
show all
Extended by:
Finder
Includes:
Logger, Persist
Defined in:
lib/cassandra-orm/model.rb,
lib/cassandra-orm/model/errors.rb,
lib/cassandra-orm/model/finder.rb,
lib/cassandra-orm/model/persist.rb

Defined Under Namespace

Modules: Finder, Persist Classes: Errors

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Finder

all, count, find, find!, find_all, first

Methods included from Logger

#execute, #execute_async, included

Methods included from Persist

#destroy, #destroy!, #save, #save!

Methods inherited from Base

configure, connect, reconnect

Constructor Details

#initialize(attrs = {}) ⇒ Model

Returns a new instance of Model.



18
19
20
21
22
 
# File 'lib/cassandra-orm/model.rb', line 18

def initialize attrs = {}
  fail 'Cannot instantiate CassandraORM::Model' if self == Model
  set attrs
  @errors = Errors.new self
end

Instance Attribute Details

#errors ⇒ Object (readonly)

Returns the value of attribute errors.



16
17
18
 
# File 'lib/cassandra-orm/model.rb', line 16

def errors
  @errors
end

Class Method Details

.inherited(base) ⇒ Object 



91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
 
# File 'lib/cassandra-orm/model.rb', line 91

def inherited base
  base.singleton_class.class_exec do
    def attributes *names
      @attributes ||= []
      if names.empty?
        @attributes
      else
        attr_accessor(*names)
        @attributes.concat names.map(&:to_sym)
        @attributes.uniq!
      end
    end

    attr_reader :primary_key
    def set_primary_key *keys
      keys.uniq!
      attributes(*keys)
      keys.each { |key|
        define_method("#{key}_with_primary_key_check=") { |val|
          if new?
            send("#{key}_without_primary_key_check=", val)
          elsif send(key) != val
            fail(CannotUpdatePrimaryKey)
          end
        }
        alias_method_chain "#{key}=", :primary_key_check
      }
      @primary_key = keys.map(&:to_sym)
    end
    private :set_primary_key

    def table_name
      name.tableize
    end

    def truncate
      execute 'truncate', "TRUNCATE #{table_name}"
    end
  end
end

Instance Method Details

#==(right) ⇒ Object 



59
60
61
62
 
# File 'lib/cassandra-orm/model.rb', line 59

def == right
  self.class == right.class &&
  primary_key_hash == right.primary_key_hash
end

#append_error(key, value, options = {}) ⇒ Object 



64
65
66
67
 
# File 'lib/cassandra-orm/model.rb', line 64

def append_error key, value, options = {}
  @errors.append key, value, options
  false
end

#append_error!(key, value, options = {}) ⇒ Object 



69
70
71
72
 
# File 'lib/cassandra-orm/model.rb', line 69

def append_error! key, value, options = {}
  append_error key, value, options
  fail ValidationError
end

#attributes ⇒ Object 



31
32
33
34
35
 
# File 'lib/cassandra-orm/model.rb', line 31

def attributes
  self.class.attributes.each_with_object({}) do |key, hash|
    hash[key] = send key
  end
end

#attributes=(attrs) ⇒ Object 



37
38
39
40
41
42
 
# File 'lib/cassandra-orm/model.rb', line 37

def attributes= attrs
  attrs = attrs.symbolize_keys
  self.class.attributes.each do |attr|
    send "#{attr}=", attrs[attr]
  end
end

#inspect ⇒ Object 



50
51
52
53
 
# File 'lib/cassandra-orm/model.rb', line 50

def inspect
  attrs = attributes.map { |k, v| "#{k}=#{v.inspect}" }.join(' ')
  "#<#{self.class.name} #{attrs}>"
end

#new? ⇒ Boolean

Returns:

  • (Boolean) 


55
56
57
 
# File 'lib/cassandra-orm/model.rb', line 55

def new?
  !@persisted
end

#primary_key_hash ⇒ Object 



44
45
46
47
48
 
# File 'lib/cassandra-orm/model.rb', line 44

def primary_key_hash
  self.class.primary_key.each_with_object({}) do |key, hash|
    hash[key] = send key
  end
end

#reload ⇒ Object 



74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
 
# File 'lib/cassandra-orm/model.rb', line 74

def reload
  hash = primary_key_hash
  keys, values = hash.keys, hash.values
  row = self.class.send(:_find_all, keys, values, limit: 1).first
  if row
    self.attributes = row
    @errors.clear
    @persisted = true
    self
  else
    @errors.clear
    @persisted = nil
    false
  end
end

#set(attrs) ⇒ Object 



24
25
26
27
28
29
 
# File 'lib/cassandra-orm/model.rb', line 24

def set attrs
  attrs.each do |k, v|
    method = :"#{k}="
    respond_to?(method) ? send(method, v) : instance_variable_set(:"@#{k}", v)
  end
end