ruby on rails - renamed a table and am getting errors -

i named table types , realized reserved word, renamed 'category`.

now when try activerecord query, error:

pg::undefinedtable: error:  relation "categories" not exist line 5:                a.attrelid = '"categories"'::regclass                                           ^ :               select a.attname, format_type(a.atttypid, a.atttypmod),                      pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod                 pg_attribute left join pg_attrdef d                   on a.attrelid = d.adrelid , a.attnum = d.adnum                a.attrelid = '"categories"'::regclass                  , a.attnum > 0 , not a.attisdropped                order a.attnum 

i have gone though code , changed relation names, model, controller, etc...but don't know error coming from. or means. here category.rb:

class category < activerecord::base has_many :projects  end 

here categories_controller.rb: class categoriescontroller < applicationcontroller

        def create             @category = category.new(category_params)             if @category.save                 redirect_to root_path             else                 redirect_to({:controller => 'application', :action => 'home'}, :notice => 'account not created! fishy.')             end         end  end 

and here trying inside user model (because want code read along lines of current_user.contributions_by_category

def contributions_by_category(array)     category = {}         array.each |subarray|             name = category.find(subarray[1].category_id).project_category;             category[name] = 0 unless category.include?(name)             category[name] += subarray[0] unless subarray[0] == nil         end     category     end 

also, inside of project model have:

class project < activerecord::base     belongs_to :user, :foreign_key => 'user_id'     belongs_to :category, :foreign_key => 'category_id' #should change has 1 association     has_many :users     has_many :payments     has_many :updates     has_many :comments     has_one :imapct   ....  end 

before switched name, able make query work in rails console rendering screen, relation exists, did change name.

any appreciated!

update:

here table data rails console:

   list of relations  schema |       name        | type  |    owner     --------+-------------------+-------+-------------  public | categories        | table | seinnaidess  public | comments          | table | seinnaidess  public | entrepreneurs     | table | seinnaidess  public | impacts           | table | seinnaidess  public | payments          | table | seinnaidess  public | projects          | table | seinnaidess  public | schema_migrations | table | seinnaidess  public | update_comments   | table | seinnaidess  public | updates           | table | seinnaidess  public | users             | table | seinnaidess 

and here schema:

activerecord::schema.define(version: 20150930040619)    # these extensions must enabled in order support database   enable_extension "plpgsql"    create_table "categories", force: :cascade |t|     t.string "category_type"   end    create_table "comments", force: :cascade |t|     t.text     "content"     t.integer  "user_id"     t.integer  "project_id"     t.datetime "created_at"     t.datetime "updated_at"   end    create_table "entrepreneurs", force: :cascade |t|     t.string   "first_name"     t.string   "last_name"     t.string   "password_digest"     t.text     "about"     t.string   "location"     t.integer  "age"     t.float    "repayment_rate"     t.integer  "project_id"     t.datetime "created_at"     t.datetime "updated_at"   end    create_table "impacts", force: :cascade |t|     t.integer  "ppl_hired",            default: 0     t.integer  "ppl_schooled",         default: 0     t.integer  "improved_housing",     default: 0     t.integer  "improved_nourishment", default: 0     t.integer  "improved_medical",     default: 0     t.integer  "community_resource",   default: 0     t.integer  "project_id"     t.datetime "created_at"     t.datetime "updated_at"   end    create_table "payments", force: :cascade |t|     t.string   "first_name"     t.string   "last_name"     t.float    "amount"     t.integer  "cc_num"     t.integer  "exp_month"     t.integer  "exp_year"     t.integer  "cvs"     t.integer  "user_id"     t.integer  "project_id"     t.datetime "created_at"     t.datetime "updated_at"     t.text     "comments"   end    create_table "projects", force: :cascade |t|     t.string   "name"     t.text     "url"     t.text     "description"     t.float    "money_needed",     default: 0.0     t.float    "money_raised",     default: 0.0     t.float    "interest_offered", default: 0.0     t.datetime "end_date"     t.integer  "category_id"     t.integer  "user_id"     t.datetime "created_at"     t.datetime "updated_at"   end    create_table "update_comments", force: :cascade |t|   end    create_table "updates", force: :cascade |t|     t.text    "content"     t.string  "url"     t.integer "project_id"     t.string  "date"   end    create_table "users", force: :cascade |t|     t.string   "first_name"     t.string   "last_name"     t.string   "user_name"     t.string   "password_digest"     t.string   "impact"     t.text     "pic_url"     t.text     "quote"     t.integer  "payment_id"     t.integer  "project_id"     t.datetime "created_at"     t.datetime "updated_at"     t.boolean  "admin"   end