Ruby on Rails: many-to-many association undefined methode on creation - ruby-on-rails

Question

I have set up members and teams models using has_many through association.
member.rb
has_many :teams, :through => :team_members
has_many :team_members
team.rb
has_many :members, :through => :team_members
has_many :team_members
team_member.rb
belongs_to :member
belongs_to :team
When I try to create a new team, I get this error:
undefined method `name' for nil:NilClass
params are:
{"utf8"=>"✓",
"authenticity_token"=>"aXpMxWxGlhogfn9EbBWciSjoMrYXbPxG8Kzha14na58=",
"team"=>{"name"=>"Ruby",
"email"=>"email#email.com",
"language"=>"En",
"link"=>"",
"logo"=>#<ActionDispatch::Http::UploadedFile:0xb3907f0 #original_filename="You-Are-Great-.gif",
#content_type="image/gif",
#headers="Content-Disposition: form-data; name=\"team[logo]\"; filename=\"You-Are-Great-.gif\"\r\nContent-Type: image/gif\r\n",
#tempfile=#<File:/tmp/RackMultipart20120723-1907-m3bi79>>},
"commit"=>"Create Team"}
The create method in teams_controller.rb is:
#team = Team.new(params[:team])
The team doesn't get created unless I assign the attributes manually one by one like
#team = Team.new(:name => params[:team][:name], :email => params[:team][:email]...)
and so! any ideas why?
EDIT:
teams_controller.rb:
class TeamsController < ApplicationController
# GET /teams
# GET /teams.json
def index
#teams = Team.all
respond_to do |format|
format.html # index.html.erb
format.json { render json: #teams }
end
end
# GET /teams/1
# GET /teams/1.json
def show
#team = Team.find(params[:id])
respond_to do |format|
format.html # show.html.erb
format.json { render json: #team }
end
end
# GET /teams/new
# GET /teams/new.json
def new
#team = Team.new
respond_to do |format|
format.html # new.html.erb
format.json { render json: #team }
end
end
# GET /teams/1/edit
def edit
#team = Team.find(params[:id])
end
# POST /teams
# POST /teams.json
def create
raise params.to_yaml
#team = Team.new(params[:team])
respond_to do |format|
if #team.save
#team_member = TeamMember.new(:team_id => #team.id, :member_id => current_member.id,
:accepted => true, :leader => true, :joined => Time.now)
if #team_member.save
format.html { redirect_to team_path(#team), notice: 'Team was successfully created.' }
format.json { render json: #team, status: :created, location: #team }
else
#team.destroy
format.html { render action: "new" }
format.json { render json: #team.errors, status: :unprocessable_entity }
end
else
format.html { render action: "new" }
format.json { render json: #team.errors, status: :unprocessable_entity }
end
end
end
# PUT /teams/1
# PUT /teams/1.json
def update
#team = Team.find(params[:id])
respond_to do |format|
if #team.update_attributes(params[:team])
format.html { redirect_to #team, notice: 'Team was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: "edit" }
format.json { render json: #team.errors, status: :unprocessable_entity }
end
end
end
# DELETE /teams/1
# DELETE /teams/1.json
def destroy
#team = Team.find(params[:id])
#team.destroy
respond_to do |format|
format.html { redirect_to teams_url }
format.json { head :no_content }
end
end
end
team.rb model:
class Team < ActiveRecord::Base
attr_accessible :name, :email, :language, :link, :logo, :team_leader
validates_presence_of :name
validates_presence_of :email
validates_presence_of :language
validates_uniqueness_of :name
has_many :leaders, :class_name => "TeamMember", :conditions => { :leader => true }
has_many :members, :through => :team_members
has_many :team_members, :conditions => { :accepted => true, :active => true }
has_attached_file :logo,
:styles => { :medium => "320x180>", :thumb => "100x100>" },
:url => "/assets/teams/:id/:style/:basename.:extension",
:path => ":rails_root/public/assets/teams/:id/:style/:basename.:extension"
end