THe code:

  def facebook_inspiration_link(impact)
    Rails.logger.debug "Facebook_inspiration_link"
    Rails.logger.debug "Impact: #{impact.to_yaml}"
    Rails.logger.debug "Impact Metrics: #{impact.impact_metrics.to_yaml}"
    Rails.logger.debug "First Impact Metric: #{impact.impact_metrics.first.to_yaml}"
    Rails.logger.debug "Metric: #{impact.impact_metrics.first.metric.to_yaml}"
    unless impact.user == current_user
      link_to('I did this too »', facebook_action_url(impact.impact_metrics.first.metric, :inspiration_id => impact.id))
    end
  end



The log output:

Facebook_inspiration_link
Impact: --- !ruby/object:Impact
attributes:
  created_at: 2008-11-11 19:38:47
  impacted_type:
  updated_at: 2008-11-11 19:38:47
  impacted_id:
  story:
  kudos_count: "0"
  headline: I saved a paper cup today by bringing a refillable one
  id: "1777"
  user_id: "11593"
  date_accomplished: 2008-11-11 19:38:47
  facebook: "1"
  inspiration_id:
attributes_cache: {}

impact_metrics:
- !ruby/object:ImpactMetric
  attributes:
    impact_id: "1777"
    quantity: "6.00"
    id: "1612"
    user_id: "11593"
    metric_id: 809
  attributes_cache: {}

  changed_attributes:
    metric_id: 404 <-----here's the wackiness, the metric_id has changed
user: !ruby/object:User
  attributes:
    salt:
    city: ""
    newsfeed_id: "12208"
    big_blue_color: main
    imported_id:
    facebook_id: "1632912393"
    created_at: 2008-11-11 17:13:48
    zip: ""
    latitude:
    image_file_name:
    crypted_password:
    remember_token_expires_at:
    is_email_notifiable: "1"
    country: ""
    private_last_name_setting: "0"
    last_activity:
    image_file_size:
    session_key: 2e56da614ca2ada819f19366-1632912393
    updated_at: 2008-11-12 11:45:41
    username: ""
    role: "0"
    image_content_type:
    id: "11593"
    long_description:
    reset_email: "0"
    private_location_setting: "0"
    last_name: ""
    is_verified: "0"
    remember_token:
    parent_id:
    imported_from:
    date_of_birth:
    description: ""
    longitude:
    private_profile_setting: "0"
    facebook_points: "75"
    first_name: ""
    email: ""
    email_validation_key:
    state: ""
    affiliated_org_id:
  attributes_cache: {}

Impact Metrics: ---
- !ruby/object:ImpactMetric
  attributes:
    impact_id: "1777"
    quantity: "6.00"
    id: "1612"
    user_id: "11593"
    metric_id: 809
  attributes_cache: {}

  changed_attributes:
    metric_id: 404
First Impact Metric: --- !ruby/object:ImpactMetric
attributes:
  impact_id: "1777"
  quantity: "6.00"
  id: "1612"
  user_id: "11593"
  metric_id: 809
attributes_cache: {}

changed_attributes:
  metric_id: 404
  Metric Load (0.000179)   SELECT * FROM `metrics` WHERE (`metrics`.`id` = 809)
Metric: --- <--- And so not metric is found, even though in script/console there is a metric, and in the DB directly too