Rails - display category name on views via relationship tables

I have two tables that I put relationship with blog and post_categories. Below is the schema:

  create_table "blogs", force: :cascade do |t|

    t.string "title"

    t.text "body"

    t.datetime "created_at", null: false

    t.datetime "updated_at", null: false

    t.string "slug"

    t.integer "status", default: 0

    t.bigint "post_category_id"

    t.index ["post_category_id"], name: "index_blogs_on_post_category_id"

    t.index ["slug"], name: "index_blogs_on_slug", unique: true

  end



  create_table "post_categories", force: :cascade do |t|

    t.string "name"

    t.text "description"

    t.datetime "created_at", null: false

    t.datetime "updated_at", null: false

  end

Now what I am trying to do is to display the category name instead of category id on my blog index.html.erb file. I did the following but did not work:

<tbody>

    <% @blogs.each do |blog| %>

      <tr>

        <td><%= blog.title %></td>

        <td><%= blog.body %></td>

        <% PostCategory.all.each do |c| %>

          <% if c.id == blog.post_category %>

          <td><%= c.name %>

          <% end %>

        <td><%= link_to 'Show', blog %></td>

        <td><%= link_to 'Edit', edit_blog_path(blog) %></td>

        <td><%= link_to 'Destroy', blog, method: :delete, data: { confirm: 'Are you sure?' } %></td>

      </tr>

    <% end %>

  </tbody>

Note: I also tried accessing it directly via <td><%= blog.post_category.name %></td>but did not work still.

Any idea how can I display the category name instead of category id associated?

asked Jan 2 at 5:23

Marc Solva

283410

If I used this <td><%= blog.post_category %></td> it gives me something like this: #<PostCategory:0x007fafd058f070>

– Marc Solva
Jan 2 at 6:17

add a comment |

I have two tables that I put relationship with blog and post_categories. Below is the schema:

  create_table "blogs", force: :cascade do |t|

    t.string "title"

    t.text "body"

    t.datetime "created_at", null: false

    t.datetime "updated_at", null: false

    t.string "slug"

    t.integer "status", default: 0

    t.bigint "post_category_id"

    t.index ["post_category_id"], name: "index_blogs_on_post_category_id"

    t.index ["slug"], name: "index_blogs_on_slug", unique: true

  end



  create_table "post_categories", force: :cascade do |t|

    t.string "name"

    t.text "description"

    t.datetime "created_at", null: false

    t.datetime "updated_at", null: false

  end

Now what I am trying to do is to display the category name instead of category id on my blog index.html.erb file. I did the following but did not work:

<tbody>

    <% @blogs.each do |blog| %>

      <tr>

        <td><%= blog.title %></td>

        <td><%= blog.body %></td>

        <% PostCategory.all.each do |c| %>

          <% if c.id == blog.post_category %>

          <td><%= c.name %>

          <% end %>

        <td><%= link_to 'Show', blog %></td>

        <td><%= link_to 'Edit', edit_blog_path(blog) %></td>

        <td><%= link_to 'Destroy', blog, method: :delete, data: { confirm: 'Are you sure?' } %></td>

      </tr>

    <% end %>

  </tbody>

Note: I also tried accessing it directly via <td><%= blog.post_category.name %></td>but did not work still.

Any idea how can I display the category name instead of category id associated?

asked Jan 2 at 5:23

Marc Solva

283410

If I used this <td><%= blog.post_category %></td> it gives me something like this: #<PostCategory:0x007fafd058f070>

– Marc Solva
Jan 2 at 6:17

add a comment |

I have two tables that I put relationship with blog and post_categories. Below is the schema:

  create_table "blogs", force: :cascade do |t|

    t.string "title"

    t.text "body"

    t.datetime "created_at", null: false

    t.datetime "updated_at", null: false

    t.string "slug"

    t.integer "status", default: 0

    t.bigint "post_category_id"

    t.index ["post_category_id"], name: "index_blogs_on_post_category_id"

    t.index ["slug"], name: "index_blogs_on_slug", unique: true

  end



  create_table "post_categories", force: :cascade do |t|

    t.string "name"

    t.text "description"

    t.datetime "created_at", null: false

    t.datetime "updated_at", null: false

  end

Now what I am trying to do is to display the category name instead of category id on my blog index.html.erb file. I did the following but did not work:

<tbody>

    <% @blogs.each do |blog| %>

      <tr>

        <td><%= blog.title %></td>

        <td><%= blog.body %></td>

        <% PostCategory.all.each do |c| %>

          <% if c.id == blog.post_category %>

          <td><%= c.name %>

          <% end %>

        <td><%= link_to 'Show', blog %></td>

        <td><%= link_to 'Edit', edit_blog_path(blog) %></td>

        <td><%= link_to 'Destroy', blog, method: :delete, data: { confirm: 'Are you sure?' } %></td>

      </tr>

    <% end %>

  </tbody>

Note: I also tried accessing it directly via <td><%= blog.post_category.name %></td>but did not work still.

Any idea how can I display the category name instead of category id associated?

asked Jan 2 at 5:23

Marc Solva

283410

I have two tables that I put relationship with blog and post_categories. Below is the schema:

  create_table "blogs", force: :cascade do |t|

    t.string "title"

    t.text "body"

    t.datetime "created_at", null: false

    t.datetime "updated_at", null: false

    t.string "slug"

    t.integer "status", default: 0

    t.bigint "post_category_id"

    t.index ["post_category_id"], name: "index_blogs_on_post_category_id"

    t.index ["slug"], name: "index_blogs_on_slug", unique: true

  end



  create_table "post_categories", force: :cascade do |t|

    t.string "name"

    t.text "description"

    t.datetime "created_at", null: false

    t.datetime "updated_at", null: false

  end

Now what I am trying to do is to display the category name instead of category id on my blog index.html.erb file. I did the following but did not work:

<tbody>

    <% @blogs.each do |blog| %>

      <tr>

        <td><%= blog.title %></td>

        <td><%= blog.body %></td>

        <% PostCategory.all.each do |c| %>

          <% if c.id == blog.post_category %>

          <td><%= c.name %>

          <% end %>

        <td><%= link_to 'Show', blog %></td>

        <td><%= link_to 'Edit', edit_blog_path(blog) %></td>

        <td><%= link_to 'Destroy', blog, method: :delete, data: { confirm: 'Are you sure?' } %></td>

      </tr>

    <% end %>

  </tbody>

Note: I also tried accessing it directly via <td><%= blog.post_category.name %></td>but did not work still.

Any idea how can I display the category name instead of category id associated?

ruby-on-rails

asked Jan 2 at 5:23

Marc Solva

283410

asked Jan 2 at 5:23

Marc Solva

283410

asked Jan 2 at 5:23

Marc Solva

283410

asked Jan 2 at 5:23

Marc Solva

283410

asked Jan 2 at 5:23

Marc Solva

283410

If I used this <td><%= blog.post_category %></td> it gives me something like this: #<PostCategory:0x007fafd058f070>

– Marc Solva
Jan 2 at 6:17

add a comment |

If I used this <td><%= blog.post_category %></td> it gives me something like this: #<PostCategory:0x007fafd058f070>

– Marc Solva
Jan 2 at 6:17

If I used this <td><%= blog.post_category %></td> it gives me something like this: #<PostCategory:0x007fafd058f070>

– Marc Solva
Jan 2 at 6:17

add a comment |

2 Answers
2

active

oldest

votes

As per you schema provided, it is noted that PostCategory object has many Blog objects

model changes,

class PostCategory < ApplicationRecord

  has_many :blogs

end



class Blog < ApplicationRecord

  belongs_to :post_category

end

view changes,

<tbody>

  <% @blogs.each do |blog| %>

    <tr>

      <td><%= blog.title %></td>

      <td><%= blog.body %></td>

      <td><%= blog.post_category.name rescue 'No post category present for this blog' %></td>

      <td><%= link_to 'Show', blog %></td>

      <td><%= link_to 'Edit', edit_blog_path(blog) %></td>

      <td><%= link_to 'Destroy', blog, method: :delete, data: { confirm: 'Are you sure?'} %></td>

    </tr>

  <% end %>

edited Jan 2 at 6:25

answered Jan 2 at 6:16

ray

3,3561829

RAY Tried this already but got undefined method `name' for nil:NilClass

– Marc Solva
Jan 2 at 6:18

updated answer, it is your data problem as association and schema is proper but you do not have data as per association. use of try method can handle issue

– ray
Jan 2 at 6:19

@MarcSolva for blog.post_category_id, there must be id present in table post_categories

– ray
Jan 2 at 6:21

It works but is it safe to just let "try" method handle the work? is this a good practice? Also can explain the association issue more?

– Marc Solva
Jan 2 at 6:22

1

@ray mitrev.net/ruby/2015/11/13/the-operator-in-ruby

– Marcin Kołodziej
Jan 2 at 9:45

|
show 9 more comments

model changes,

class PostCategory < ApplicationRecord

  has_many :blogs

end



class Blog < ApplicationRecord

  belongs_to :post_category

end

view changes,

<tbody>

  <% @blogs.each do |blog| %>

    <tr>

      <td><%= blog.title %></td>

      <td><%= blog.body %></td>

      <td><%= blog.post_category.try(:name) %></td>

      <td><%= link_to 'Show', blog %></td>

      <td><%= link_to 'Edit', edit_blog_path(blog) %></td>

      <td><%= link_to 'Destroy', blog, method: :delete, data: { confirm: 'Are you sure?'} %></td>

    </tr>

  <% end %>

edited Jan 2 at 6:36

answered Jan 2 at 5:40

Cryptex Technologies

800213

PG::UndefinedColumn: ERROR: column post_categories.blog_id does not exist LINE 1: ... "post_categories".* FROM "post_categories" WHERE "post_cate...

– Marc Solva
Jan 2 at 6:03

First reset your database and start creating

– Cryptex Technologies
Jan 2 at 6:05

Why you are calling post_categories.blog_id

– Cryptex Technologies
Jan 2 at 6:06

Downvoted! blog belongs_to :post_category as blogs table have foregin key post_category_id

– ray
Jan 2 at 6:12

belongs_to :post_category as blogs place this on my blog model but I got this: compile error # GET /blogs.json def index @blogs = Blog.all end def post_category_0

– Marc Solva
Jan 2 at 6:15

|
show 6 more comments

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

As per you schema provided, it is noted that PostCategory object has many Blog objects

model changes,

class PostCategory < ApplicationRecord

  has_many :blogs

end



class Blog < ApplicationRecord

  belongs_to :post_category

end

view changes,

<tbody>

  <% @blogs.each do |blog| %>

    <tr>

      <td><%= blog.title %></td>

      <td><%= blog.body %></td>

      <td><%= blog.post_category.name rescue 'No post category present for this blog' %></td>

      <td><%= link_to 'Show', blog %></td>

      <td><%= link_to 'Edit', edit_blog_path(blog) %></td>

      <td><%= link_to 'Destroy', blog, method: :delete, data: { confirm: 'Are you sure?'} %></td>

    </tr>

  <% end %>

edited Jan 2 at 6:25

answered Jan 2 at 6:16

ray

3,3561829

RAY Tried this already but got undefined method `name' for nil:NilClass

– Marc Solva
Jan 2 at 6:18

updated answer, it is your data problem as association and schema is proper but you do not have data as per association. use of try method can handle issue

– ray
Jan 2 at 6:19

@MarcSolva for blog.post_category_id, there must be id present in table post_categories

– ray
Jan 2 at 6:21

It works but is it safe to just let "try" method handle the work? is this a good practice? Also can explain the association issue more?

– Marc Solva
Jan 2 at 6:22

1

@ray mitrev.net/ruby/2015/11/13/the-operator-in-ruby

– Marcin Kołodziej
Jan 2 at 9:45

|
show 9 more comments

As per you schema provided, it is noted that PostCategory object has many Blog objects

model changes,

class PostCategory < ApplicationRecord

  has_many :blogs

end



class Blog < ApplicationRecord

  belongs_to :post_category

end

view changes,

<tbody>

  <% @blogs.each do |blog| %>

    <tr>

      <td><%= blog.title %></td>

      <td><%= blog.body %></td>

      <td><%= blog.post_category.name rescue 'No post category present for this blog' %></td>

      <td><%= link_to 'Show', blog %></td>

      <td><%= link_to 'Edit', edit_blog_path(blog) %></td>

      <td><%= link_to 'Destroy', blog, method: :delete, data: { confirm: 'Are you sure?'} %></td>

    </tr>

  <% end %>

edited Jan 2 at 6:25

answered Jan 2 at 6:16

ray

3,3561829

RAY Tried this already but got undefined method `name' for nil:NilClass

– Marc Solva
Jan 2 at 6:18

updated answer, it is your data problem as association and schema is proper but you do not have data as per association. use of try method can handle issue

– ray
Jan 2 at 6:19

@MarcSolva for blog.post_category_id, there must be id present in table post_categories

– ray
Jan 2 at 6:21

It works but is it safe to just let "try" method handle the work? is this a good practice? Also can explain the association issue more?

– Marc Solva
Jan 2 at 6:22

1

@ray mitrev.net/ruby/2015/11/13/the-operator-in-ruby

– Marcin Kołodziej
Jan 2 at 9:45

|
show 9 more comments

As per you schema provided, it is noted that PostCategory object has many Blog objects

model changes,

class PostCategory < ApplicationRecord

  has_many :blogs

end



class Blog < ApplicationRecord

  belongs_to :post_category

end

view changes,

<tbody>

  <% @blogs.each do |blog| %>

    <tr>

      <td><%= blog.title %></td>

      <td><%= blog.body %></td>

      <td><%= blog.post_category.name rescue 'No post category present for this blog' %></td>

      <td><%= link_to 'Show', blog %></td>

      <td><%= link_to 'Edit', edit_blog_path(blog) %></td>

      <td><%= link_to 'Destroy', blog, method: :delete, data: { confirm: 'Are you sure?'} %></td>

    </tr>

  <% end %>

edited Jan 2 at 6:25

answered Jan 2 at 6:16

ray

3,3561829

As per you schema provided, it is noted that PostCategory object has many Blog objects

model changes,

class PostCategory < ApplicationRecord

  has_many :blogs

end



class Blog < ApplicationRecord

  belongs_to :post_category

end

view changes,

<tbody>

  <% @blogs.each do |blog| %>

    <tr>

      <td><%= blog.title %></td>

      <td><%= blog.body %></td>

      <td><%= blog.post_category.name rescue 'No post category present for this blog' %></td>

      <td><%= link_to 'Show', blog %></td>

      <td><%= link_to 'Edit', edit_blog_path(blog) %></td>

      <td><%= link_to 'Destroy', blog, method: :delete, data: { confirm: 'Are you sure?'} %></td>

    </tr>

  <% end %>

edited Jan 2 at 6:25

answered Jan 2 at 6:16

ray

3,3561829

edited Jan 2 at 6:25

answered Jan 2 at 6:16

ray

3,3561829

answered Jan 2 at 6:16

ray

3,3561829

answered Jan 2 at 6:16

ray

3,3561829

RAY Tried this already but got undefined method `name' for nil:NilClass

– Marc Solva
Jan 2 at 6:18

updated answer, it is your data problem as association and schema is proper but you do not have data as per association. use of try method can handle issue

– ray
Jan 2 at 6:19

@MarcSolva for blog.post_category_id, there must be id present in table post_categories

– ray
Jan 2 at 6:21

It works but is it safe to just let "try" method handle the work? is this a good practice? Also can explain the association issue more?

– Marc Solva
Jan 2 at 6:22

1

@ray mitrev.net/ruby/2015/11/13/the-operator-in-ruby

– Marcin Kołodziej
Jan 2 at 9:45

|
show 9 more comments

RAY Tried this already but got undefined method `name' for nil:NilClass

– Marc Solva
Jan 2 at 6:18

updated answer, it is your data problem as association and schema is proper but you do not have data as per association. use of try method can handle issue

– ray
Jan 2 at 6:19

@MarcSolva for blog.post_category_id, there must be id present in table post_categories

– ray
Jan 2 at 6:21

It works but is it safe to just let "try" method handle the work? is this a good practice? Also can explain the association issue more?

– Marc Solva
Jan 2 at 6:22

1

@ray mitrev.net/ruby/2015/11/13/the-operator-in-ruby

– Marcin Kołodziej
Jan 2 at 9:45

RAY Tried this already but got undefined method `name' for nil:NilClass

– Marc Solva
Jan 2 at 6:18

updated answer, it is your data problem as association and schema is proper but you do not have data as per association. use of try method can handle issue

– ray
Jan 2 at 6:19

@MarcSolva for blog.post_category_id, there must be id present in table post_categories

– ray
Jan 2 at 6:21

It works but is it safe to just let "try" method handle the work? is this a good practice? Also can explain the association issue more?

– Marc Solva
Jan 2 at 6:22

@ray mitrev.net/ruby/2015/11/13/the-operator-in-ruby

– Marcin Kołodziej
Jan 2 at 9:45

|
show 9 more comments

model changes,

class PostCategory < ApplicationRecord

  has_many :blogs

end



class Blog < ApplicationRecord

  belongs_to :post_category

end

view changes,

<tbody>

  <% @blogs.each do |blog| %>

    <tr>

      <td><%= blog.title %></td>

      <td><%= blog.body %></td>

      <td><%= blog.post_category.try(:name) %></td>

      <td><%= link_to 'Show', blog %></td>

      <td><%= link_to 'Edit', edit_blog_path(blog) %></td>

      <td><%= link_to 'Destroy', blog, method: :delete, data: { confirm: 'Are you sure?'} %></td>

    </tr>

  <% end %>

edited Jan 2 at 6:36

answered Jan 2 at 5:40

Cryptex Technologies

800213

PG::UndefinedColumn: ERROR: column post_categories.blog_id does not exist LINE 1: ... "post_categories".* FROM "post_categories" WHERE "post_cate...

– Marc Solva
Jan 2 at 6:03

First reset your database and start creating

– Cryptex Technologies
Jan 2 at 6:05

Why you are calling post_categories.blog_id

– Cryptex Technologies
Jan 2 at 6:06

Downvoted! blog belongs_to :post_category as blogs table have foregin key post_category_id

– ray
Jan 2 at 6:12

belongs_to :post_category as blogs place this on my blog model but I got this: compile error # GET /blogs.json def index @blogs = Blog.all end def post_category_0

– Marc Solva
Jan 2 at 6:15

|
show 6 more comments

model changes,

class PostCategory < ApplicationRecord

  has_many :blogs

end



class Blog < ApplicationRecord

  belongs_to :post_category

end

view changes,

<tbody>

  <% @blogs.each do |blog| %>

    <tr>

      <td><%= blog.title %></td>

      <td><%= blog.body %></td>

      <td><%= blog.post_category.try(:name) %></td>

      <td><%= link_to 'Show', blog %></td>

      <td><%= link_to 'Edit', edit_blog_path(blog) %></td>

      <td><%= link_to 'Destroy', blog, method: :delete, data: { confirm: 'Are you sure?'} %></td>

    </tr>

  <% end %>

edited Jan 2 at 6:36

answered Jan 2 at 5:40

Cryptex Technologies

800213

PG::UndefinedColumn: ERROR: column post_categories.blog_id does not exist LINE 1: ... "post_categories".* FROM "post_categories" WHERE "post_cate...

– Marc Solva
Jan 2 at 6:03

First reset your database and start creating

– Cryptex Technologies
Jan 2 at 6:05

Why you are calling post_categories.blog_id

– Cryptex Technologies
Jan 2 at 6:06

Downvoted! blog belongs_to :post_category as blogs table have foregin key post_category_id

– ray
Jan 2 at 6:12

belongs_to :post_category as blogs place this on my blog model but I got this: compile error # GET /blogs.json def index @blogs = Blog.all end def post_category_0

– Marc Solva
Jan 2 at 6:15

|
show 6 more comments

model changes,

class PostCategory < ApplicationRecord

  has_many :blogs

end



class Blog < ApplicationRecord

  belongs_to :post_category

end

view changes,

<tbody>

  <% @blogs.each do |blog| %>

    <tr>

      <td><%= blog.title %></td>

      <td><%= blog.body %></td>

      <td><%= blog.post_category.try(:name) %></td>

      <td><%= link_to 'Show', blog %></td>

      <td><%= link_to 'Edit', edit_blog_path(blog) %></td>

      <td><%= link_to 'Destroy', blog, method: :delete, data: { confirm: 'Are you sure?'} %></td>

    </tr>

  <% end %>

edited Jan 2 at 6:36

answered Jan 2 at 5:40

Cryptex Technologies

800213

model changes,

class PostCategory < ApplicationRecord

  has_many :blogs

end



class Blog < ApplicationRecord

  belongs_to :post_category

end

view changes,

<tbody>

  <% @blogs.each do |blog| %>

    <tr>

      <td><%= blog.title %></td>

      <td><%= blog.body %></td>

      <td><%= blog.post_category.try(:name) %></td>

      <td><%= link_to 'Show', blog %></td>

      <td><%= link_to 'Edit', edit_blog_path(blog) %></td>

      <td><%= link_to 'Destroy', blog, method: :delete, data: { confirm: 'Are you sure?'} %></td>

    </tr>

  <% end %>

edited Jan 2 at 6:36

answered Jan 2 at 5:40

Cryptex Technologies

800213

edited Jan 2 at 6:36

answered Jan 2 at 5:40

Cryptex Technologies

800213

answered Jan 2 at 5:40

Cryptex Technologies

800213

answered Jan 2 at 5:40

Cryptex Technologies

800213

PG::UndefinedColumn: ERROR: column post_categories.blog_id does not exist LINE 1: ... "post_categories".* FROM "post_categories" WHERE "post_cate...

– Marc Solva
Jan 2 at 6:03

First reset your database and start creating

– Cryptex Technologies
Jan 2 at 6:05

Why you are calling post_categories.blog_id

– Cryptex Technologies
Jan 2 at 6:06

Downvoted! blog belongs_to :post_category as blogs table have foregin key post_category_id

– ray
Jan 2 at 6:12

belongs_to :post_category as blogs place this on my blog model but I got this: compile error # GET /blogs.json def index @blogs = Blog.all end def post_category_0

– Marc Solva
Jan 2 at 6:15

|
show 6 more comments

PG::UndefinedColumn: ERROR: column post_categories.blog_id does not exist LINE 1: ... "post_categories".* FROM "post_categories" WHERE "post_cate...

– Marc Solva
Jan 2 at 6:03

First reset your database and start creating

– Cryptex Technologies
Jan 2 at 6:05

Why you are calling post_categories.blog_id

– Cryptex Technologies
Jan 2 at 6:06

Downvoted! blog belongs_to :post_category as blogs table have foregin key post_category_id

– ray
Jan 2 at 6:12

belongs_to :post_category as blogs place this on my blog model but I got this: compile error # GET /blogs.json def index @blogs = Blog.all end def post_category_0

– Marc Solva
Jan 2 at 6:15

PG::UndefinedColumn: ERROR: column post_categories.blog_id does not exist LINE 1: ... "post_categories".* FROM "post_categories" WHERE "post_cate...

– Marc Solva
Jan 2 at 6:03

First reset your database and start creating

– Cryptex Technologies
Jan 2 at 6:05

Why you are calling post_categories.blog_id

– Cryptex Technologies
Jan 2 at 6:06

Downvoted! blog belongs_to :post_category as blogs table have foregin key post_category_id

– ray
Jan 2 at 6:12

belongs_to :post_category as blogs place this on my blog model but I got this: compile error # GET /blogs.json def index @blogs = Blog.all end def post_category_0

– Marc Solva
Jan 2 at 6:15

|
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