Join two SharePoint 2013 lists using operator

I have two SharePoint lists. 1) Posts and 2) Categories

The Posts list has a lookup field called 'Category' into the Categories list.

I am trying to use the $expand option to join the two lists but I'm unsuccessful.  I'm trying to follow the example used in this site but I'm confused.

Any ideas?

I've tried the following and many other combinations but I get errors
http://understandsp.com/blog/_api/web/lists/getbytitle('Posts')/items/?&select=Title,Category/Id&$expand=Title/Id

Here's where you can look at my lists
http://understandsp.com/blog/_layouts/15/start.aspx#/_layouts/15/viewlsts.aspx

Please help!
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IsaacSharePoint Client Side DeveloperAsked:
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Rajendra ShekhawatSolution ArchitectCommented:
Hi,

I have used following REST Query to get the data related to lookup.

Posts - Parent List
Posts has Category Lookup Column - Display Column 'Title'

Please try below query -

origin + "/_api/web/lists/getbytitle('Posts')/items?$select=Title, Category/Title&$expand=Category/Title

Let me know, in case of any issues.

Cheers,
Raj
IsaacSharePoint Client Side DeveloperAuthor Commented:
That did not work.
http://understandsp.com/blog/_api/web/lists/getbytitle('Posts')/items/?&select=Title,Category/Title&$expand=Category/Title
When using a blog site, it's really different. If you have access to a blog site, try it for your self. Post and Categories are created by default.
Rajendra ShekhawatSolution ArchitectCommented:
Hi,

As you said lists in your question, i missed blog.

Field Name of Category in blog is PostCategory .

I have tried below query on blog and works fine, gives me list of categories.

Try this -

http://c4968397007/sites/blog/_api/web/lists/getbytitle('Posts')/items?$select=Title,PostCategory/Title&$expand=PostCategory/Title

Cheers,
Raj
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Rajendra ShekhawatSolution ArchitectCommented:
Hi,

Did it work ?

Cheers,
Raj

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IsaacSharePoint Client Side DeveloperAuthor Commented:
That worked! Thank you very much.  I've been dealing with this for days.
IsaacSharePoint Client Side DeveloperAuthor Commented:
Rajendra Shekhawat,

Can you please assist with this question? Thanks!
http://www.experts-exchange.com/questions/28735845/REST-api-postCatgory-showing-as-object.html
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