Class: Lyra::Associations::VirtualRecord

Inherits:
Object
  • Object
show all
Defined in:
lib/lyra/associations/event_aware.rb

Overview

Virtual record representing a record from events (not in DB)

Provides a read-only interface that looks like an ActiveRecord model but is backed by event data instead of a database row.

Defined Under Namespace

Classes: ReadOnlyRecord

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(model_class, id, state) ⇒ VirtualRecord

Returns a new instance of VirtualRecord.



164
165
166
167
168
 
# File 'lib/lyra/associations/event_aware.rb', line 164

def initialize(model_class, id, state)
  @model_class = model_class
  @id = id
  @state = state.transform_keys(&:to_sym)
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args) ⇒ Object 



200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
 
# File 'lib/lyra/associations/event_aware.rb', line 200

def method_missing(method, *args)
  method_name = method.to_s

  # Getter
  if @state.key?(method)
    @state[method]
  # Boolean query
  elsif method_name.end_with?("?")
    field = method_name.chomp("?").to_sym
    !!@state[field]
  # Setter (rejected - read only)
  elsif method_name.end_with?("=")
    raise ReadOnlyRecord, "Cannot modify a virtual record"
  else
    nil
  end
end

Instance Attribute Details

#id ⇒ Object (readonly)

Returns the value of attribute id.



162
163
164
 
# File 'lib/lyra/associations/event_aware.rb', line 162

def id
  @id
end

Instance Method Details

#[](key) ⇒ Object

Access attributes



188
189
190
 
# File 'lib/lyra/associations/event_aware.rb', line 188

def [](key)
  @state[key.to_sym]
end

#attributes ⇒ Object 



192
193
194
 
# File 'lib/lyra/associations/event_aware.rb', line 192

def attributes
  @state.except(:deleted)
end

#new_record? ⇒ Boolean

Returns:

  • (Boolean) 


174
175
176
 
# File 'lib/lyra/associations/event_aware.rb', line 174

def new_record?
  true
end

#pending_projection? ⇒ Boolean

Indicates this is a virtual record from events

Returns:

  • (Boolean) 


179
180
181
 
# File 'lib/lyra/associations/event_aware.rb', line 179

def pending_projection?
  true
end

#persisted? ⇒ Boolean

Returns:

  • (Boolean) 


170
171
172
 
# File 'lib/lyra/associations/event_aware.rb', line 170

def persisted?
  false
end

#readonly? ⇒ Boolean

Returns:

  • (Boolean) 


183
184
185
 
# File 'lib/lyra/associations/event_aware.rb', line 183

def readonly?
  true
end

#respond_to_missing?(method, include_private = false) ⇒ Boolean

Returns:

  • (Boolean) 


218
219
220
 
# File 'lib/lyra/associations/event_aware.rb', line 218

def respond_to_missing?(method, include_private = false)
  @state.key?(method) || method.to_s.end_with?("?") || super
end

#to_param ⇒ Object 



196
197
198
 
# File 'lib/lyra/associations/event_aware.rb', line 196

def to_param
  id&.to_s
end