Class: HerokuSchemas::SchemaReference

Inherits:
Object
  • Object
show all
Defined in:
lib/heroku-schemas/schema_reference.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ SchemaReference

String references to schemas can take the following forms: my_app my_app:my_schema my_app:MY_DATABASE_URL:my_schema



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# File 'lib/heroku-schemas/schema_reference.rb', line 10

def initialize(options)
  defaults = {
    heroku: nil,
    string_reference: nil,
    related_apps: []
  }
  options.reverse_merge!(defaults)
  @heroku = options[:heroku]
  @string_reference = options[:string_reference]
  @related_apps = options[:related_apps]
  @database_variable = nil
  @schema = nil

  raise 'String reference not provided' if @string_reference.blank?
  configure
end

Instance Attribute Details

#app ⇒ Object (readonly)

Returns the value of attribute app.



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# File 'lib/heroku-schemas/schema_reference.rb', line 3

def app
  @app
end

#base_database_url ⇒ Object (readonly)

Returns the value of attribute base_database_url.



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# File 'lib/heroku-schemas/schema_reference.rb', line 3

def base_database_url
  @base_database_url
end

#database_app ⇒ Object (readonly)

Returns the value of attribute database_app.



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# File 'lib/heroku-schemas/schema_reference.rb', line 3

def database_app
  @database_app
end

#database_url ⇒ Object (readonly)

Returns the value of attribute database_url.



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# File 'lib/heroku-schemas/schema_reference.rb', line 3

def database_url
  @database_url
end

#database_variable ⇒ Object (readonly)

Returns the value of attribute database_variable.



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# File 'lib/heroku-schemas/schema_reference.rb', line 3

def database_variable
  @database_variable
end

#schema ⇒ Object (readonly)

Returns the value of attribute schema.



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# File 'lib/heroku-schemas/schema_reference.rb', line 3

def schema
  @schema
end

Instance Method Details

#==(schema_reference) ⇒ Object 



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# File 'lib/heroku-schemas/schema_reference.rb', line 82

def ==(schema_reference)
  return true if self.base_database_url == schema_reference.base_database_url &&
    self.schema == schema_reference.schema
  false
end

#app_config_variables(app) ⇒ Object 



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# File 'lib/heroku-schemas/schema_reference.rb', line 73

def app_config_variables(app)
  @heroku.get_config_vars(app).body
end

#configure ⇒ Object 



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# File 'lib/heroku-schemas/schema_reference.rb', line 27

def configure
  refs = @string_reference.split(':')
  raise "Invalid schema reference: #{@string_reference}" unless [1, 2, 3].include?(refs.length)
  if refs.length == 1
    @app = refs.first
  elsif refs.length == 2
    @app, @schema = refs
  else
    @app, @database_variable, @schema = refs
  end

  app_variables = app_config_variables(@app)
  @database_variable ||= 'DATABASE_URL'
  @database_url = app_variables[@database_variable]
  @schema ||= SchemaUtilities.url_to_schema(@database_url)
  raise "Database URL not found for database variable #{@database_variable}" if @database_url.blank?

  validation_message = SchemaUtilities.validate_schema(@schema)
  raise validation_message if validation_message != true
  
  @database_url = @base_database_url = get_base_database_url(@database_url)
  @database_url = "#{@database_url}?schema_search_path=#{@schema}" unless @schema == 'public'

  if @database_variable == 'DATABASE_URL'
    @related_apps.each do |app|
      config_variables = app_config_variables(app)
      database_variable = find_database_variable(config_variables, @base_database_url)
      if database_variable
        @database_variable = database_variable
        @database_app = app
        break
      end
    end
  end
  raise "Database variable not found" if @database_variable.blank?
end

#find_database_variable(config_variables, database_url) ⇒ Object 



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# File 'lib/heroku-schemas/schema_reference.rb', line 64

def find_database_variable(config_variables, database_url)
  standardized_database_url = get_base_database_url(database_url)
  config_variables.each do |name, value|
    next if name == 'DATABASE_URL'
    return name if get_base_database_url(value) == standardized_database_url
  end
  nil
end

#get_base_database_url(url) ⇒ Object 



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# File 'lib/heroku-schemas/schema_reference.rb', line 77

def get_base_database_url(url)
  return nil if url.nil?
  url.split('?').first
end