When Rails tries to save Seed data, the foreign key is NOT NULL constraint failed.

names=%w (Taro Jiro Hana John Mike Sophie Bill Alex Mary Tom)
fnames=["Sato", "Suzuki", "Takahashi", "Tanaka"]
gnames=["Taro", "Jiro", "Hanako"]
affiliation=["University of Tokyo Faculty of Law", "Recruit Co., Ltd." and "Kayak"]
intros=["I want to learn programming.", "I will teach you how to learn JS effectively."]
0.upto(9)do|idx|
    member = Member.create(
        name —names [idx],
        full_name: "#{fnames[idx%4]}#{gnames[idx%3]}",
        email: "#{names[idx]}@xample.com",
        birthday: "1981-12-01",
        gender: [0,0,1] [idx%3],
        affiliation: "#{affiliations[idx%3]}",
        intro: "#{intros[idx%2]}",
        administrator: (idx==0),
        password: "password",
        password_confirmation: "password"
    )
    path=Rails.root.join("db/seeds/development", "member#{idx%3+1}.jpg")
    file=Rack::Test::UploadedFile.new(path, "image/jpeg", true)
    MemberImage.create(
        member —member,
        uploaded_image:file
    )
end

create_table "member_images", force: :cascade do | t |
    t. integer "member_id", null: false
    t.binary "data"
    t.string "content_type"
    t.datetime "created_at", null:false
    t.datetime "updated_at", null:false
    end

    add_index "member_images", ["member_id", name: "index_member_images_on_member_id"

    create_table "members", force: :cascade do | t |
    t.string "name", null: false
    t.string "full_name"
    t.string "email"
    t.date "birthday"
    t. integer "gender", default:0, null:false
    t.text "affiliation"
    t.text "intro"
    t. boolean "administrator", default: false, null: false
    t.datetime "created_at", null:false
    t.datetime "updated_at", null:false
    t.string "hashed_password"
end