Ошибка при попытке присвоить значение внешнему ключу

Я работаю над проектом Ruby on Rails, и при присваивании значения внешнему ключу появляется следующая ошибка:

ActiveRecord::InvalidForeignKey in InformationController#import

Mysql2::Error: Cannot add or update a child row: a foreign key 
constraint fails ('sobrecupos_development'.'information', CONSTRAINT 
'fk_rails_21c7b6e26c' FOREIGN KEY ('program_id') REFERENCES 'programs' 
('id')): UPDATE 'information' SET 'system_plan' = '2879.0', 
'program_id' = 2879, 'updated_at' = '2018-04-03 15:32:07' WHERE 
'information'.'id' = 11

Предполагается, что этот ключ назначается из внешнего файла, но когда я пытаюсь это сделать, я получаю указанную выше ошибку. Я попытался назначить ключ явно, чтобы проверить, имеет ли он отношение к возможному несуществующему значению, но я все еще получаю эту ошибку.

Вот мой файл schema.rb

ActiveRecord::Schema.define(version: 20180402215605) do

  create_table "coordinators", force: :cascade, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8" do |t|
    t.string   "name"
    t.string   "lastname"
    t.integer  "department_id"
    t.datetime "created_at",                       null: false
    t.datetime "updated_at",                       null: false
    t.string   "email",               default: "", null: false
    t.datetime "remember_created_at"
    t.integer  "sign_in_count",       default: 0,  null: false
    t.datetime "current_sign_in_at"
    t.datetime "last_sign_in_at"
    t.string   "current_sign_in_ip"
    t.string   "last_sign_in_ip"
    t.string   "username"
    t.index ["department_id"], name: "index_coordinators_on_department_id", using: :btree
    t.index ["email"], name: "index_coordinators_on_email", unique: true, using: :btree
    t.index ["username"], name: "index_coordinators_on_username", unique: true, using: :btree
  end

  create_table "departments", force: :cascade, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8" do |t|
    t.string   "name"
    t.datetime "created_at",   null: false
    t.datetime "updated_at",   null: false
    t.string   "code"
    t.string   "abbreviation"
    t.index ["code"], name: "index_departments_on_code", unique: true, using: :btree
  end

  create_table "groups", force: :cascade, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8" do |t|
    t.integer  "subject_id"
    t.integer  "professor_id"
    t.integer  "available_spots"
    t.integer  "total_spots"
    t.datetime "created_at",      null: false
    t.datetime "updated_at",      null: false
    t.index ["professor_id"], name: "index_groups_on_professor_id", using: :btree
    t.index ["subject_id"], name: "index_groups_on_subject_id", using: :btree
  end

  create_table "information", force: :cascade, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8" do |t|
    t.string   "level"
    t.integer  "program_id"
    t.string   "request_type"
    t.string   "act_resolution"
    t.date     "resolution_date"
    t.string   "dependency"
    t.decimal  "PAPA",                  precision: 10, scale: 1
    t.integer  "registered_credits"
    t.integer  "outstanding_credits"
    t.decimal  "completion_percentage", precision: 10
    t.integer  "tuition_amount"
    t.string   "academic_history_id"
    t.datetime "created_at",                                     null: false
    t.datetime "updated_at",                                     null: false
    t.integer  "student_id"
    t.boolean  "was_saved"
    t.string   "system_plan"
    t.string   "academic_period"
    t.string   "document"
    t.index ["program_id"], name: "index_information_on_program_id", using: :btree
    t.index ["student_id"], name: "index_information_on_student_id", using: :btree
  end

  create_table "professors", force: :cascade, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8" do |t|
    t.string   "name"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

  create_table "programs", force: :cascade, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8" do |t|
    t.string   "name"
    t.integer  "department_id"
    t.datetime "created_at",    null: false
    t.datetime "updated_at",    null: false
    t.string   "code"
    t.string   "program_type"
    t.index ["code"], name: "index_programs_on_code", unique: true, using: :btree
    t.index ["department_id"], name: "index_programs_on_department_id", using: :btree
  end

  create_table "students", force: :cascade, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8" do |t|
    t.string   "name"
    t.string   "lastname"
    t.string   "username"
    t.datetime "created_at",                       null: false
    t.datetime "updated_at",                       null: false
    t.string   "email",               default: "", null: false
    t.datetime "remember_created_at"
    t.integer  "sign_in_count",       default: 0,  null: false
    t.datetime "current_sign_in_at"
    t.datetime "last_sign_in_at"
    t.string   "current_sign_in_ip"
    t.string   "last_sign_in_ip"
    t.string   "document"
    t.index ["email"], name: "index_students_on_email", unique: true, using: :btree
    t.index ["username"], name: "index_students_on_username", unique: true, using: :btree
  end

  create_table "subject_requests", force: :cascade, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8" do |t|
    t.integer  "group_id"
    t.integer  "information_id"
    t.boolean  "was_canceled"
    t.string   "approbation_state"
    t.string   "inscription_state"
    t.string   "replace_to"
    t.datetime "created_at",         null: false
    t.datetime "updated_at",         null: false
    t.boolean  "accept_other_group"
    t.string   "subject_code"
    t.string   "group_code"
    t.string   "typology"
    t.string   "subject_plan"
    t.index ["group_id"], name: "index_subject_requests_on_group_id", using: :btree
    t.index ["information_id"], name: "index_subject_requests_on_information_id", using: :btree
  end

  create_table "subjects", force: :cascade, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8" do |t|
    t.string   "name"
    t.integer  "department_id"
    t.datetime "created_at",    null: false
    t.datetime "updated_at",    null: false
    t.string   "code"
    t.integer  "credits"
    t.index ["code"], name: "index_subjects_on_code", unique: true, using: :btree
    t.index ["department_id"], name: "index_subjects_on_department_id", using: :btree
  end

  add_foreign_key "coordinators", "departments"
  add_foreign_key "groups", "professors"
  add_foreign_key "groups", "subjects"
  add_foreign_key "information", "programs"
  add_foreign_key "information", "students"
  add_foreign_key "programs", "departments"
  add_foreign_key "subject_requests", "groups"
  add_foreign_key "subject_requests", "information", on_delete: :cascade
  add_foreign_key "subjects", "departments"
end

И вот строка кода, где я пытаюсь присвоить значение внешнему ключу

information.program_id = information.system_plan