Method: VCR::Configuration#define_cassette_placeholder

Defined in:
lib/vcr/configuration.rb

#define_cassette_placeholder(placeholder, tag = nil) {|interaction| ... } ⇒ Object Also known as: filter_sensitive_data

Sets up a #before_record and a #before_playback hook that will insert a placeholder string in the cassette in place of another string. You can use this as a generic way to interpolate a variable into the cassette for a unique string. It’s particularly useful for unique sensitive strings like API keys and passwords.

Examples:

VCR.configure do |c|
  # Put "<GITHUB_API_KEY>" in place of the actual API key in
  # our cassettes so we don't have to commit to source control.
  c.filter_sensitive_data('<GITHUB_API_KEY>') { GithubClient.api_key }

  # Put a "<USER_ID>" placeholder variable in our cassettes tagged with
  # :user_cassette since it can be different for different test runs.
  c.define_cassette_placeholder('<USER_ID>', :user_cassette) { User.last.id }
end

Parameters:

  • placeholder (String) —

    The placeholder string.

  • tag (Symbol) (defaults to: nil) —

    Set this to apply this only to cassettes with a matching tag; otherwise it will apply to every cassette.

Yields:

  • block that determines what string to replace

Yield Parameters:

Yield Returns:

  • the string to replace



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# File 'lib/vcr/configuration.rb', line 225

def define_cassette_placeholder(placeholder, tag = nil, &block)
  before_record(tag) do |interaction|
    orig_text = call_block(block, interaction)
    log "before_record: replacing #{orig_text.inspect} with #{placeholder.inspect}"
    interaction.filter!(orig_text, placeholder)
  end

  before_playback(tag) do |interaction|
    orig_text = call_block(block, interaction)
    log "before_playback: replacing #{orig_text.inspect} with #{placeholder.inspect}"
    interaction.filter!(placeholder, orig_text)
  end
end