Class: Observ::NullPrompt

Inherits:
Object
  • Object
show all
Defined in:
app/models/observ/null_prompt.rb

Overview

Null Object pattern for Prompt Used when a prompt is not found, providing a fallback with the same interface

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name:, fallback_text:) ⇒ NullPrompt

Returns a new instance of NullPrompt.



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# File 'app/models/observ/null_prompt.rb', line 11

def initialize(name:, fallback_text:)
  @name = name
  @prompt = fallback_text
  @config = {}
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'app/models/observ/null_prompt.rb', line 9

def config
  @config
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'app/models/observ/null_prompt.rb', line 9

def name
  @name
end

#prompt ⇒ Object (readonly)

Returns the value of attribute prompt.



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# File 'app/models/observ/null_prompt.rb', line 9

def prompt
  @prompt
end

Instance Method Details

#archived? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'app/models/observ/null_prompt.rb', line 67

def archived?
  false
end

#compile(variables = {}) ⇒ Object

Compile prompt with Mustache templating (same as Prompt)



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# File 'app/models/observ/null_prompt.rb', line 23

def compile(variables = {})
  return @prompt if variables.empty?

  Mustache.render(@prompt, variables)
end

#compile_with_validation(variables = {}) ⇒ Object

Compile with validation (raises if missing top-level variables) Note: Variables inside sections (loops) are validated at render time by Mustache



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# File 'app/models/observ/null_prompt.rb', line 31

def compile_with_validation(variables = {})
  required_vars = required_variables
  provided_keys = variables.keys.map(&:to_s)

  missing_vars = required_vars.reject do |var|
    # Handle dot notation (e.g., "user.name" - check if "user" key exists)
    root_key = var.split(".").first
    provided_keys.include?(var) || provided_keys.include?(root_key)
  end

  if missing_vars.any?
    raise Observ::VariableSubstitutionError, "Missing variables: #{missing_vars.join(', ')}"
  end

  compile(variables)
end

#draft? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'app/models/observ/null_prompt.rb', line 59

def draft?
  false
end

#id ⇒ Object 



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# File 'app/models/observ/null_prompt.rb', line 75

def id
  nil
end

#inspect ⇒ Object 



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# File 'app/models/observ/null_prompt.rb', line 84

def inspect
  "#<Observ::NullPrompt name: #{name.inspect}, fallback: #{prompt[0..50].inspect}...>"
end

#persisted? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'app/models/observ/null_prompt.rb', line 71

def persisted?
  false
end

#production? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'app/models/observ/null_prompt.rb', line 63

def production?
  false
end

#required_variables ⇒ Object

Extract top-level variables from template (for validation purposes)



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# File 'app/models/observ/null_prompt.rb', line 49

def required_variables
  template_without_sections = strip_sections(@prompt)
  template_without_sections.scan(/\{\{([^#\^\/!>\{\s][^}\s]*)\}\}/).flatten.uniq
end

#state ⇒ Object

Null prompts are always in a "fallback" state



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# File 'app/models/observ/null_prompt.rb', line 55

def state
  "fallback"
end

#to_s ⇒ Object

For logging/debugging



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# File 'app/models/observ/null_prompt.rb', line 80

def to_s
  "NullPrompt(#{name})"
end

#version ⇒ Object

Returns nil to indicate this is not a real prompt



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# File 'app/models/observ/null_prompt.rb', line 18

def version
  nil
end